In this image, the Solar Dynamics Observatory (SDO) captured an X1.2 class solar flare, peaking on May 15, 2013. Credit: NASA/SDO
What’s more fun than something that misbehaves? When it comes to solar dynamics, we know a lot, but there are many things we don’t yet understand. For example, when a particle filled solar flare lashes out from the Sun, its magnetic field lines can do some pretty unexpected things – like split apart and then rapidly reconnect. According to the flux-freezing theorem, these magnetic lines should simply “flow away in lock-step” with the particles. They should stay intact, but they don’t. It’s not just a simple rule they break… it’s a law of physics.
What can explain it? In a paper published in the May 23 issue of “Nature”, an interdisciplinary research team led by a Johns Hopkins mathematical physicist may just have found a plausible explanation. According to the group, the underlying factor is turbulence – the “same sort of violent disorder that can jostle a passenger jet when it occurs in the atmosphere” – or the one your brother leaves behind after he’s eaten baked beans. By employing a well-organized and logically constructed computer modeling technique, the researchers were able to simulate what happens when magnetic field lines meet up with turbulence in a solar flare. Armed with this information, they were then able to state their case.
“The flux-freezing theorem often explains things beautifully,” said Gregory Eyink, a Department of Applied Mathematics and Statistics professor who was lead author of the “Nature” study. “But in other instances, it fails miserably. We wanted to figure out why this failure occurs.”
Just what is the flux-freezing theorem? Maybe you’ve heard of Hannes Alfvén. He was a Swedish electrical engineer, plasma physicist and winner of the 1970 Nobel Prize in Physics for his work on magnetohydrodynamics (MHD). He’s the man responsible for explaining what we now know as Alfvén waves – a low-frequency travelling oscillation of the ions and the magnetic field in plasma. Well, some 70 years ago, he came up with the thought that magnetic lines of force sail along a locomotive fluid similar to snippets of thread flowing along a stream. It should be impossible for them to break and then join again. However, solar physicists have discovered this just isn’t the case when it comes to activity within a particularly violent solar flare. In their observations, they have determined that the magnetic field lines within these flares can stretch to the breaking point and then reconnect in a surprisingly quick amount of time – as little as 15 minutes. When this happens, it expels a copious amount of energy which, in turn, powers the flare.
“But the flux-freezing principle of modern plasma physics implies that this process in the solar corona should take a million years!” Eyink animatedly states. “A big problem in astrophysics is that no one could explain why flux-freezing works in some cases but not others.”
Of course, there has always been speculation that turbulence may have been the root source of the enigmatic behavior. Time for investigation? You bet. Eyink then joined forces – and minds – with other experts in astrophysics, mechanical engineering, data management and computer science, based at Johns Hopkins and other institutions. “By necessity, this was a highly collaborative effort,” Eyink said. “Everyone was contributing their expertise. No one person could have accomplished this.”
Gregory Eyink, professor of applied mathematics and statistics at Johns Hopkins. Photo by Nat Creamer.The next step was to create a computer simulation – a simulation which could duplicate the plasma state of solar flare activity and all the nuances the charged particles undergo during different conditions. “Our answer was very surprising,” stated Eyink. “Magnetic flux-freezing no longer holds true when the plasma becomes turbulent. Most physicists expected that flux-freezing would play an even larger role as the plasma became more highly conducting and more turbulent, but, as a matter of fact, it breaks down completely. In an even greater surprise, we found that the motion of the magnetic field lines becomes completely random. I do not mean ‘chaotic,’ but instead as unpredictable as quantum mechanics. Rather than flowing in an orderly, deterministic fashion, the magnetic field lines instead spread out like a roiling plume of smoke.”
Of course, other solar experts feel there may be alternative answers for this rule-breaking activity within solar flares, but as Eyink says, “I think we made a pretty compelling case that turbulence alone can account for field-line breaking.”
What is most exciting is the collaborative effort of the team members from such widely varied disciplines. It was a group effort which aided Eyink to come up with this new theory on the solar flare riddle. “We used ground-breaking new database methods, like those employed in the Sloan Digital Sky Survey, combined with high-performance computing techniques and original mathematical developments,” he said. “The work required a perfect marriage of physics, mathematics and computer science to develop a fundamentally new approach to performing research with very large datasets.”
In conclusion, Eyink noted this type of research work may very well give us a better understanding of solar flares and coronal mass ejections. As we know, this type of dangerous “space weather” can be harmful to astronauts, disrupt communications satellites, and even be responsible for the shut-down of electrical power grids on Earth. And you know what that means… no satellite TV and no power to watch it by. But, that’s O.K.
“I don’t stay out late. Don’t care to go. I’m home about eight… Just me and my radio. Ain’t misbehavin’.. Savin’ my love for you.”
A dense network of small rivers or swampy areas appears to connect some of the seas on Saturn's moon Titan, as seen in this comparison of data of the same area from two instruments on NASA's Cassini spacecraft. Images from the radar instrument are on the left and images from the visual and infrared mapping spectrometer (VIMS) are on the right. Credit: NASA/JPL-Caltech/University of Arizona
Are there waves on Titan’s lakes and seas? Cassini scientists say that the best chance of answering this question is with the May 23 flyby of Titan, when the Cassini spacecraft will be just 970 km (603 miles) over Titan’s biggest ‘lake,’ the northern sea named Ligeia Mare.
Lakes, seas, and rivers were discovered on Titan by Cassini in 2005, and since then, scientists and space enthusiasts have been intrigued about the possibility of what could be found in these bodies of hydrocarbon liquid. Future potential missions such as paddleboats have even been proposed.
Lakes, seas and rivers of liquid hydrocarbons cover much of the Titan’s northern hemisphere. Additionally, these hydrocarbons may rain down on the surface. The questions is, are these frigid liquid bodies capable of producing wave action, or would they be a rigid type of frigid? With surface temperature at -178 degrees Celsius (-289 degrees Fahrenheit), Titan’s environment is too cold for life as we may know it, but its environment, rich in the building blocks of life, is of great interest to astrobiologists.
Additionally, new models of Titan’s atmosphere prediction that as the seasons change in Titan’s northern hemisphere, waves could ripple across the moon’s hydrocarbon seas, and possibly even hurricanes could begin to swirl over these areas, too. The model predicting waves tries to explain data from the moon obtained so far by Cassini.
“If you think being a weather forecaster on Earth is difficult, it can be even more challenging at Titan,” said Scott Edgington, Cassini’s deputy project scientist at NASA’s Jet Propulsion Laboratory, Pasadena, Calif. “We know there are weather processes similar to Earth’s at work on this strange world, but differences arise due to the presence of unfamiliar liquids like methane. We can’t wait for Cassini to tell us whether our forecasts are right as it continues its tour through Titan spring into the start of northern summer.”
For the flyby on May 23, the altimetry data that will be collected by the radar instrument could show whether the surface of that sea is thick like molasses or as thin as liquid water on Earth.
In addition, radar will look for changes in small northern lakes last observed in previous flybys, the T-16 and T-19 flybys.
This flyby is a carefully planned sibling of the following flyby; the combination of the data from T-91 and T-92 will provide stereo views of the same geography, which will tell us about the depth of the lake walls.
Three bright planets gather in the northwestern sky this week. This map shows the sky 30 minutes after sunset from the middle latitudes. Stellarium
Planning a barbecue this weekend? You may want to top it off with a look at three bright planets shuttling about the western sky at dusk. Jupiter, Venus and Mercury gather for nearly a week of delightful alignments including three separate conjunctions staring right now. Mercury and Venus pair up on Friday; Mercury and Jupiter on Sunday and Venus and Jupiter on Monday. All three form a series of ever-changing triangular arrangements as the nights go by.
Three bright planets will highlight the northwestern sky this week and early next. Mercury is shown in pink and Jupiter in yellow. Time is 30 minutes after sunset facing northwest. They’ll be closest together – less than 3 degrees apart – on the night of the 26th. Stellarium
Brightest of the bunch is Venus followed by Jupiter and then Mercury. The key to seeing them all is a clear sky and unobstructed view of the west-northwest horizon. Best time for viewing is a half hour to 45 minutes after sunset. Although the diagrams make the planets look like largish disks, difference in size is a device to show their brightness. Bigger means brighter.
Mercury gradually climbs higher in the coming days, Venus will remain in nearly the same spot and Jupiter slowly drops off toward the horizon. Seeing three planets bunch up isn’t rare, but it is unusual – all the more reason to go for a look if your skies are clear. Alignments like this occur because all 8 planets lie in essentially the same flat plane. As we look across the solar system, sometimes near planets and far planets lie along the same line of sight and appear side-by-side in the sky. They may look close to each other but of course they’re millions of miles apart.
Positions of the planets on May 27. The arrow shows the point of view from Earth. Notice that the line of sight through all three takes our gaze near the sun. That’s why they’re only visible shortly after sunset in a bright sky. Click image to see a cool, interactive planet display. Credit: dd.dynamicdiagrams.com
This week Venus is 154 million miles (248 million km) from Earth, Mercury 113 million (182 million km) and Jupiter a distant 562 million (904 million km). The planet position diagram above will give you a sense of their current arrangement in space.
Whenever you go planet-seeking in bright twilight, I always recommend bringing along a pair of binoculars. They penetrate haze and make finding these bright little dots much easier. Enjoy the show!
The RepRap self-replicating printer 'Mendel". (Credit: CharlesC under a Creative Commons Attribution-Share Alike 3.0 Unported license).
The International Space Station may soon have its very own Star Trek food replicator.
Earlier this week, NASA awarded a $125,000 six month grant to the Systems & Materials Research Cooperation to design a 3D printer capable of printing a pizza from 30-year shelf stable foodstuffs.
Founded by Anjan Contractor, SMRC built a basic food printer from a chocolate printer to win NASA’s Small Business Innovation Research Program in a trial video. The design is based on an open-source RepRap 3D printer.
Contractor and SMRC will begin construction on the pizza-printing prototype in two weeks. Pizza has been one item missing from astronauts menu for years. The 3D printer would “build-up” a pizza serving by first layering out the dough onto a heated plate then adding tomato sauce and toppings.
But this isn’t your mother’s pizza, as the proteins would be provided by cartridge injectors filled with organic base powders derived from algae, insects and grass.
Yummy stuff, to be sure!
Of course, one can see an immediate application of 3D food printing technology for long duration space missions. Contractor and SMRC envisions 3D food printing as the wave of the future, with the capacity to solve world hunger for a burgeoning human population.
Could a 3D food printer be coming to a kitchen near you?
Curiously, printing confectioneries and pet food pellets would be the simplest application of said technology. Printing a soufflé and crowned rack of lamb will be tougher. 3D printing technology has made great strides as of late, and RepRap has made a printer which is capable of printing itself. Those who fear the rise of Von Neumann’s self-replicating robots should take note…
Should we welcome or fear our self-replicating, pizza-bearing overlords?
The International Space Station is due for the delivery of its first 3D printer in 2014. This will give astros the capability to fabricate simple parts and tools onsite without requiring machining. Of course, the first question on our minds is: How will a 3D printer function in zero-g? Will one have tomato paste an insect parts flying about? Recent flights aboard a Boeing 727 by Made in Space Inc have been testing 3D printers in micro-gravity environments.
Made in Space demonstrates 3D Printing technology headed to the ISS next year. (Credit: Made in Space Inc./NASA).
Further afield, 3D replicators may arrive on the Moon or Mars ahead of humans, building a prefab colony with raw materials available for colonists to follow.
Artist’s conception of a lunar base constructed with 3D printing technology. (Credit: NASA Lunar Science Institute).
Will 3D food replicators pioneered by SMRC be a permanent fixture on crewed long duration space missions? Plans such as Dennis Tito’s Mars 2018 flyby and the one way Mars One proposal will definitely have to address the dietary dilemmas of hungry astronauts. Biosphere 2 demonstrated that animal husbandry will be impractical on long term missions. Future Martian colonists will definitely eat much farther down the food chain to survive. SpaceX head Elon Musk has recently said in a Twitter response to PETA that he won’t be the “Kale Eating Overlord of Mars,” and perhaps “micro-ranching” of insects will be the only viable alternative to filet mignon on the Red Planet. Hey, it beats Soylent Green… and the good news is, you can still brew beer from algae!
Diagram of a proposed 3D food printer based on ReRap. (Credit: SMRC).
Would YOU take a one way journey to Mars? Would you eat a bug to do it? It’ll be interesting to watch these 3D printers in action as they take to space and print America’s favorite delivery fast food. But it’s yet to be seen if home replicators will put Dominos Pizza out of business anytime soon. Perhaps they’ll only be viable if they can print a pizza in less than “30 minutes!”
The Dream Chaser space plane atop a United Launch Alliance Atlas V rocket. Image Credit: SNC
It was surely one of those moments where NASA could hardly wait to tear off the shrink wrap. Sierra Nevada Corp.’s privately constructed Dream Chaser spacecraft engineering test article arrived at the Dryden Flight Research Center last week — wrapped in plastic for shipping protection — ahead of some flight and runway tests in the next few months.
“Tests at Dryden will include tow, captive-carry and free-flight tests of the Dream Chaser. A truck will tow the craft down a runway to validate performance of the nose strut, brakes and tires,” NASA stated.
“The captive-carry flights will further examine the loads it will encounter during flight as it is carried by an Erickson Skycrane helicopter. The free flight later this year will test Dream Chaser’s aerodynamics through landing.”
The ultimate goal is to get the United States bringing its own astronauts into space again.
A Sierra Nevada employee removes plastic wrapping from Dream Chaser after it arrives at NASA’s Dryden Flight Research Center in southern California. Credit: NASA
Sierra Nevada, Space Exploration Technologies (SpaceX) and the Boeing Co. are all receiving NASA funding under its Commercial Crew Integrated Capability (CCiCap) initiative that is intended to restart flights from American soil into low-Earth orbit.
For Sierra Nevada, the company aims to launch its mini shuttle aboard an Atlas V rocket and then, like the shuttle, come back to Earth on a runway. SpaceX and Boeing are taking a different path — making spacecraft capable of launching on the Falcon 9 and Atlas V rockets (respectively) and then coming home under a parachute.
There’s still some questions about when the program will start, though. In media reports, NASA administrator Charles Bolden has said funding threats for NASA’s 2014 request are imperiling the current commercial crew target of 2017.
NASA astronaut Jack Fischer and three others recently took part in approach and landing simulations of the Dream Chaser at Langley Research Center in Hampton. Check out the video below.
Sol-X CEO Blaze Sanders wearing a Final Frontier Design space suit. Credit: Solar System Express.
Editor’s note: This guest post was written by Ron Atkins, a life-long supporter of human space exploration and an ardent advocate of “NewSpace” and Commercial Spaceflight. He curates and maintains “The NewSpace Daily” on Scoop.it
Tony Stark has been to a lot of cool places in that Iron Man get-up of his. But low Earth orbit might still be a bit beyond his operational flight envelope. Not so for the developers of the revolutionary RL Mark VI Space Diving suit. A hi-tech ensemble consisting of augmented reality goggles, power gloves, control moment gyros, and a low-cost commercial space suit, the RL Mark VI will allow future thrill seekers and space tourists an experience that up until now could only be imagined in the boldest science fiction.
A joint collaboration between Solar System Express and Juxtopia LLC., two minority-owned hi-tech startups both based in Baltimore, Maryland, the RL MARK VI Space Diving configuration will allow the well-equipped space tourist of the near future the opportunity to actually return to Earth without his spaceship.
Space diving is the next big step beyond sky diving, and it is envisioned as a concept that would allow spaceflight participants a means of escape from a possibly disastrous on-orbit emergency, or perhaps just a new recreational activity for those no longer satisfied with merely jumping out of aircraft. The RL MARK VI would allow high-altitude jumps from near-space, suborbital space, and eventually low Earth orbit itself.
The first few flight tests of the MARK VI hardware will follow a profile very reminiscent to that of the recent record-breaking Red Bull Stratos dive of Felix Baumgartner, where the daring aerialist completed his plunge through the stratosphere with a soft parachute touchdown back on terra firma. But the ultimate goal of this futuristic project is far more radical than that. Eventually, through the use of modern “wing suit” skydiving technology and assisted by miniature aerospike engines attached to specially designed footwear, the space diver will end his spectacular glide through the heavens with a propulsive, power-assisted landing on two feet. No parachute. At all. Just like Tony Stark does it in the movies.
In addition to Hollywood, the RL Mark VI also draws upon history for its inspiration. Major Robert Lawrence, United States Air Force, was America’s first African-American astronaut. Major Lawrence was killed on December 8, 1967 in a test flight at Edwards Air Force Base in California before his dream of flying in space ever came to pass. In his honor the principal design team at Solar System Express chose to use his initials for the product code name of this revolutionary new concept.
On October 2, 2012, the birthday of Robert Lawrence, Blaze Sanders, Chief Technology Officer of Solar System Express, ratified a licensing agreement with Dr. Jayfus Doswell, president and CEO of Juxtopia, for the use of Juxtopia’s Augmented Reality (AR) head mounted display technology.
Similar in functionality to Google Glass, Juxtopia’s AR Goggles are primarily intended to provide the space diver with a continuous stream of vital information that will keep him on course and within safe life-support parameters throughout the duration of his jump. These visually displayed real-time dynamic analytics will tell the jumper his heart rate, respiration, internal space suit temperature, and his external temperature as well. They will provide data on GPS location, elevation, and rates of acceleration and deceleration. An FAA radar display of the local airspace will always indicate his current relative position.
Example of the graphical symbology that will be displayed by the Juxtopia AR Goggles during a typical RL MARK IV space dive. Credit: Blaze Sanders, solarsystemexpress.com
Unlike Google Glass there will be no video mode for these goggles. Instead they will work on the principal of “Optical See-Through,” much like the Heads Up Display on a modern fighter jet, that overlays numerical information and other visual symbology over the pilot’s view of the outside world. In the words of Dr. Doswell, “Video mode works fine for Hollywood, but in real life if you lose video during the jump then you’re flying blind and unlike in the movies there is no quick reboot option.”
The goggles will respond to voice commands specifically addressed to the name that the diver has designated for the RL MARK VI‘s system computer. Special software algorithms will filter the diver’s voice and eliminate all “false positives” such as wind, air, engine sounds and any other noise that is not human speech. The final result of this filtered audio signal is referred to as “pure speech.” Such audio commands will be used to turn the RL MARK VI’s systems on and off, to eject various hardware components from the diver’s body at different altitudes, to control suit cams and various lighting options, and to control voice communications to a ground control station.
In addition to voice commands, according to Dr. Doswell, “other human-computer interface modalities are being investigated for control of the MARK VI during its high speed decent as well.” Interfaces such as the electrical activity in your muscles harnessed by gesture control systems from MYO, and a distance only radio frequency sensor developed by Dr. Kuhlman at the University of Maryland, College Park, MD.
Modern fighter aircraft also employ specific audio outputs in cases of emergency or imminent danger. The MARK VI will be no different. Juxtopia is developing a culturally-specific system of programmable user preferences that will allow the diver to select his own audio alarms for any possible in-flight emergency and any other critical decision points such as altitude level or diminishing fuel state. This approach will help to enhance the international marketability of the MARK VI as well as ensure safety throughout the space dive for potential users from a variety of different cultures.
This video provides a taste of what space diving will be like:
Falling through the vacuum of space will be quite different than a dive that begins in the relative thickness of Earth’s lower atmosphere. There will be no aerodynamic forces acting upon the diver’s body that will allow him to stabilize his jump. This problem will be solved by a pair of gyroscopic boots and the fingertip controls built into the gloves of the diver’s spacesuit. Commands so issued to the control momentum gyroscopes built into his footwear will establish proper attitude and help to steady his fall through the airless void.
As a safety precaution a flat spin compensator will automatically actuate after more than five seconds if the diver is unable to maintain adequate manual control. As the diver descends through the upper atmosphere, eventually the air will thicken to the point where aerodynamic forces will allow him to control the attitude of his body. Olav Zipser, word-renowned skydiver and lead jumper on the FreeFly Astronaut Project, has praised the new suit. “Your product would be a great way to stabilize my decent during the first 30 seconds of free fall, when there is virtually zero atmosphere,” he said.
CAD representation of the RL MARK VI’s gyroscopic boot prototype. Credit: Blaze Sanders, solarsystemexpress.com
The final function of the diver’s gyroscopic boots will kick in as he nears the surface of the Earth, and he fires off his miniature aerospike thrusters to smoothly lower himself to the ground for a two-point upright landing.
Two different landing scenarios are presently under consideration: “a feet-down” landing where the aerospikes fire into action from an altitude of hundred feet, gently lowering the diver down to earth; and the much more daring and challenging “wing suit flare up” where the diver swoops within ten feet of pay dirt before pulling up sharply and then lighting off his thrusters to initiate his controlled descent to the ground.
Solar System Express intends to first test this propulsive landing capability somewhere around 2016, with a production model of the RL MARK VI coming to market about a year later. Until then any live tests of the system will conclude with traditional parachute jumps. Data collected during these jumps, along with rigorous control system testing and computer simulated recreations of each space dive, will enable Blaze Sanders and his team to refine the parameters and the protocols required for a text book propulsive landing.
CAD representation of the RL MARK VI’s high-intensity LED chest piece prototype. Credit: Blaze Sanders, solarsystemexpress.com
Mounted on the front of the jumper’s space suit will be a “high intensity LED chest piece” powered by energy-storing super capacitors and equipped with miniature stereo cameras which will collect much of the data necessary for recreating the jump in a 3D computer simulation. When finally transferred to video all of this collected 3D data should easily yield the kind of YouTube upload that one can point to with pride for years to come.
The Gravity Development Board, a proprietary piece of hardware designed by Solar System Express, will serve as the main interface between the MARK VI’s three major components as well as the device which controls all critical systems.
According to Mr. Sanders, “The GDB will be the first space-rated open hardware electronic prototyping board, enabling any type of person to create space qualified hardware. The GDB will replace the Arduino Uno® as the preferred high-level prototyping environment, by being up to forty times faster, seventy percent smaller, having integrated high power drivers (capable of handling one hundred times the current), with more flexible Input/Output configurations, and yet be still much easier to program via 12 Blocks™, the powerful, intuitive visual language used for robotic programming. Engineers, artists, and designers are thus enabled to create any project they can imagine. Our quick release breakout board, the ‘Ejection Seat™,’ allows for easy prototyping, yet keeps the GDB form factor small and robust enough to use in New Space start-up product releases.”
Final Frontier Design, of Brooklyn, New York, is working with Solar System Express on a customized version of their low-cost Intra-Vehicular Activity IVA 3G spacesuit, first introduced to the public last year and successfully crowd funded through an online kickstarter campaign. The entire RL MARK VI ensemble, along with the 3G spacesuit and a protective thermal outer covering, will be put through a rigorous testing regime beginning in June of 2014. Ground based testing will commence with a series of thermal and vacuum chamber tests, and vertical wind tunnel tests to be conducted at the Goddard Spaceflight Center in Greenbelt, Maryland.
The protective thermal covering will be fashioned from lightweight layers of aerogel and NASA Space Shuttle-like flexible insulation blankets formed into a garment that will serve as the spacesuit’s outermost layer. This is the material that will protect the space diver from the heat of reentry as he plunges through the earth’s upper atmosphere. Solar System Express has already started conversations with several wing suit manufacturers interested in employing this revolutionary thermal technology into their product line.
The first tests at altitude should begin around July of 2016. They will commence with two-kilometer parachute jumps from a helium balloon-tethered tower that will comprise the major test platform of The LiftPort Group’s Lunar Space Elevator Project. Eventually near-space jumps from as high as 40 kilometers will be conducted by Olav Zipser and his FreeFly Astronaut Project using a specially modified rocket designed and manufactured by InterOrbital Systems of Mojave, California.
No firm dates have been set for suborbital and orbital testing but initial plans call for the use of a human medical robot prototype supplied by Juxtopia to be used as the test subject for these first jumps before real live space divers eventually become involved.
Blaze Sanders estimates the total development costs to bring the RL MARK VI to market at around $2.2 million. He has already invested about $100,000 of his own time and money into the project. In the next three years he expects to generate another $1.1 million dollars in revenue through sales of his company’s Gravity Development Board. He expects to generate additional revenue from a wide variety of sources including ongoing consulting fees, government grants and loans, angel investment, kickstarter campaigns, and technical consulting fees from motion picture productions already interested in the use of his technology, as well as a video game simulation also based on his revolutionary hardware.
Should he ultimately succeed then, who knows, one day he may end up just as rich and successful as Tony Stark himself. He’s already got the suit. And he’s prepared to take it to dazzling new heights.
NASA astronaut Sally Ride, who died in 2012. Credit: NASA
Sally Ride was only 32 years old when she flew into space for the first time 30 years ago, in June 1983. She died last year at 61, at an age that many considered very young. In that generation of time, however, the exploits of America’s first woman in space in flight and education touched countless Americans.
This week, the accolades are piling up for the two-time space flyer. Besides her astronaut exploits, she was a Rogers Commission investigator of the 1986 Challenger explosion and the founder of Sally Ride Science, which encourages children to pursue careers in science, technology, education and math (STEM).
In the past few days alone, Ride generated a bunch of posthumous tributes:
– She will receive the Presidential Medal of Freedom sometime later this year;
– The EarthKAM science instrument (which includes participation from students) on the International Space Station will bear her name.
And that’s not all. There were also star-studded public ceremonies devoted to her memory.
Student dancers from the North Carolina School of the Arts perform during a national tribute to Sally Ride at the John F. Kennedy Center for the Performing Arts on May 20, 2013. Credit: NASA/Bill Ingalls
Music, art and science all met at a gala at Washington, D.C.’s John F. Kennedy Center for the Performing Arts on Monday (May 20). The performances focused on things that had meaning to Ride, NASA stated, including a performance of Claude Debussy’s “Clair de Lune” and a reading of Mary Oliver’s poem “The Summer Day.”
Speakers at the event included astronaut Leland Melvin (now NASA’s associate administrator for education), astronaut Pam Melroy (a former space shuttle commander), and Senator Barbara Mikulski of Maryland.
“I’m thrilled to pay tribute to Sally because her dedication and superb talent cemented the value of women’s contributions in space and in science, smoothing the path for all women to achieve success,” stated Melroy.
“Sally showed the world what was possible, opening the eyes of millions of women and men to what could be. Her achievements in space inspired a generation of young women, and her achievements in STEM education will pass that legacy of inspiration on to future generations.”
The Smithsonian also held a lecture in honor of Ride’s memory on May 17.
The 1.5-hour lecture (which is just above this text and definitely worth your time to see) includes commentary from a cross-section of space experts on Ride’s legacy. Speakers represented everything from the Smithsonian National Air and Space Museum to NASA’s Johnson Space Center to USA Today.
“We all admire Dr. Ride, but I don’t know that everyone in the room appreciates fully and remembers fully the history of what she accomplished,” said Margaret Weitekamp, a curator in the Smithsonian’s space history division who focuses on women in aviation, in opening remarks to the event.
Weitekamp pointed to investigations in the 1950s concerning women in space, showing that they could have advantages over men: they’re smaller (easier to fit in a spacecraft) and at the time were linked to studies showing women have fewer pulmonary problems, a higher tolerance to pain, and better performance in isolation tests.
She also cited early forays for women in space, including Lovelace’s Women in Space program, which she characterized as the first thorough physiological investigation of how women fare in that field. You can read more about their exploits on this NASA page.
What do you think is Sally Ride’s greatest legacy? Share your thoughts in the comments.
Comet C/2011 L4 PANSTARRS on May 21, 2013, when its anti-tail had grown to more than 12 full moons in length. The original main tail of the comet - to the right of the head - has faded and shortened. Credit: Damian Peach
While comets can’t tell lies, they do sometimes grow long noses. As the weeks click by and our perspective on Comet L4 PANSTARRS changes, its original plume-like dust tail has shrunk and faded while a second tail just won’t stop growing.
Comet PANSTARRS’ orbital plane slices (marked by gray lines) slices right through the plane of the planets. Earth crosses that orbital plane on May 27. As we look up into space at the comet (blue arrow), all the dust it shed along its path – including a fine sheet of particles – stacks up to create a narrow, streak-like tail pointing toward the sun. The shorter, active dust tail sticks up and away (top). Credit: NASA with my own additions
I’m talking about the anti-tail, so called because it points toward the sun instead of away. Like the normal dust tail, an anti-tail is formed from fresh dust blown back from the comet’s head by the pressure of sunlight. As the comet continues along its orbital path, last week’s dust lingers behind, forming a “trail of breadcrumbs” in its wake. Right now those breadcrumbs look like a light saber straight out of Star Wars. Time exposure photographs show a striking sunward-pointing appendage more than 6 degrees (12 full moons) long. I’ve been keeping an eye on Comet PANSTARRS here at home and can report that the anti-tail is plainly visible with a telescope under dark skies. Watching it grow from a short nub to the most dominant feature of this remarkable object has been the highlight of many a clear night.
Our current “edge on” view of Comet PANSTARRS is similar to looking down on it from high above the Earth’s north pole, where the dust stacks up to create a bright, streak-like tail. Credit: NASA/JPL/my own additions
Nothing stands still in our solar system. Earth’s moving, the comet’s moving. Later this week on May 26-27, Earth will pass directly through the comet’s orbital plane, which slices through the plane of the planets at a very steep angle. As the Earth approaches this intersection, we look up (from the northern hemisphere) and stare squarely into the long trail of dusty debris deposited by PANSTARRS during its recent swing around the sun in March. It gets better.
If we step back in time to May 9, we see that the anti-tail was neither as long nor as pronounced because the Earth was further from the comet’s orbital plane. Because we were more broadside to the comet then, the dust sheet is much more obvious. It extends millions of miles into space but is only 5,000-10,000 miles thick. Credit: Michael Jaeger
Sunlight pushes the smaller particles into a vast, thin sheet or fan extending millions of miles into space well beyond the path traveled by the comet’s nucleus. Since we now see PANSTARRS almost “edge-on”, all that dust overlaps from our perspective to form a thick, bright line sticking out of the comet’s head. It’s as if we’re seeing the ghost of PANSTARRS from the recent past still lingering in space. If we could somehow see the whole works broadside, the comet would appear fainter, spread out and much more diffuse.
Simulated views of dust shed by PANSTARRS’ in its orbit around the sun. Dust piles up in the edge-on view to create a skinny, saber-like tail vs. a faint, broad tail (right). Illustration: Bob King
The Milky Waystands out as a band of light distinct from the thin scree of stars for the very same reason; our gaze cuts edge-on through our galaxy’s flattened disk where stars are most concentrated. Like comet dust, they pile atop one other to create a distinct ribbon of fuzzy light slicing across the night sky.
Going back even further to April 10, the anti-tail (short stub to left of bright head) was just getting started. It’s completely dwarfed by the comet’s main dust tail and fan of tinier dust particles. Compare this photo to the current view. Click to enlarge. Credit: Michael Jaeger
In the next few days the tail could grow considerably longer and intensify in brightness as we move closer to the comet’s orbital plane. Unfortunately the moon will be at or near full at the same time, making it tougher to fully appreciate this amazing apparition at least with binoculars and telescopes. Cameras will have better luck. Will that stop you from looking? I hope not. Either way, you can use this map to help you find Comet PANSTARRS and check it out yourself.
Map showing Comet C/2011 L4 PANSTARRS’ location tonight through June 21. Positions are marked off every three nights with stars are shown to about 8th magnitude. Credit: created with Chris Marriott’s SkyMap software
When you do spot the anti-tail, don’t be fooled. It may appear to be pointing at the sun, but it’s only dust spread along a path once tread.
A magnificent view of the very thin anti tail of Comet PANSTARRS, as seen on May 22, 2013 from near Payson, Arizona. Credit and copyright: Chris Schur.A negative image showing Comet PANSTARRS and its very thin anti tail, as seen on May 22, 2013 from near Payson, Arizona. Credit and copyright: Chris Schur.
We at Universe Today have been wondering, where did Chris Hadfield find the time to do all the greatvideos he put together during his five months on the International Space Station, all while his Expedition set records for the amount of scientific research performed? Now there’s even more. Hadfield teamed up with Jamie Hyneman and Adam Savage of Mythbusters fame, who now are part of the Tested crew, too, to produce three different videos about living in space; specifically about eating and what to do with any free time astronauts might have.
“Working with Adam and Jamie was fun!” Hadfield said via Twitter. “Mutual mustache appreciation.”
In the video above, Jamie and Adam learn about Chris Hadfield’s clever “space darts” invention, and propose a new game for Hadfield to test while he’s on orbit. Spoiler: duct tape is involved.
Making medical diagnoses aboard Space Station can be a tricky business (Image: NASA)
Even though astronauts receive some general medical training in preparation for a stay aboard the ISS, most of them still aren’t medical professionals by any means — and with the inherent difficulties of microgravity and the relatively noisy environment inside the Station, even a simple diagnostic task like listening to a heartbeat can be a challenge.
That’s why engineering students at Johns Hopkins University have developed a special “out of this world” space stethoscope designed to work well while in orbit… as well as down here on Earth.
Space is serene because no air means no sound. But inside the average spacecraft, with its whirring fans, humming computers and buzzing instruments, it can be as raucous as a party filled with laughing, talking people.
“Imagine trying to get a clear stethoscope signal in an environment like that, where the ambient noise contaminates the faint heart signal. That is the problem we set out to solve,” said Elyse Edwards, a senior from Issaquah, Wash., who teamed up on the project with fellow seniors Noah Dennis, a senior from New York City, and Shin Shin Cheng, from Sibu, Sarawak, Malaysia.
Components for a space stethoscope (Photo: Will Kirk/homewoodphoto.jhu.edu)
The students worked under the guidance of James West, a Johns Hopkins research professor in electrical and computer engineering and co-inventor of the electret microphone used in telephones and in almost 90 percent of the more than two billion microphones produced today.
Together, they developed a stethoscope that uses both electronic and mechanical strategies to help the device’s internal microphone pick up sounds that are clear and discernible – even in the noisy spacecraft, and even when the device is not placed perfectly correctly on the astronaut’s body.
“Considering that during long space missions, there is a pretty good chance an actual doctor won’t be on board, we thought it was important that the stethoscope did its job well, even when an amateur was the one using it,” Dennis said.
The device also includes many other performance-enhancing improvements, including low power consumption, rechargeable batteries, mechanical exclusion of ambient noise and a suction cup, so that it sticks firmly onto the patient’s chest, says Cheng.
Though developed for NASA’s use in outer space, this improved stethoscope could also be put to use here on Earth in combat situations, where ambient noise is abundant, and in developing countries, where medical care conditions are a bit more primitive.
West also plans to use the device to record infants’ heart and lung sounds in developing countries as part of a project that will attempt to develop a stethoscope that knows how to identify the typical wheezing and crackling breath sounds associated with common diseases.
