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NASA astronaut Mike Hopkins holds a spare ammonia pump module during a spacewalk Dec. 24, 2013. Hopkins and fellow Expedition 38 Rick Mastracchio (top) performed two spacewalks to replace a pump blamed for crippling one of the International Space Station's two cooling loops Dec. 11. Credit: NASA TV (screenshot)
Toxic snowflakes in space were just one obstacle astronauts faced down today (Dec. 24) as they successfully replaced an ammonia pump that will, if all goes to plan, put the space station back in full service in a few hours.
“They’re just completely surrounding us now,” radioed NASA astronaut Rick Mastracchio of the ammonia flakes as the astronauts clipped four fluid lines into place on to the spare pump. NASA said the ammonia was just residual fluid and not indicative of a leak. “Some little ones, some big ones,” he added.
Within a few minutes, however, the ammonia dissipated. Some flakes did strike the spacesuits of Mastracchio and fellow NASA spacewalker Mike Hopkins, causing NASA to do a modified decontamination procedure where the astronauts stayed in a vacuum for a few extra minutes inside the airlock. (The sun’s heat bakes off ammonia over time, and the crew was outside long enough for most ammonia to dissipate, NASA said.)
The spacewalk completed with no further drama at 7 hours and 30 minutes, earning high praise for the participating astronauts from Mission Control in Houston.
“It’s the best Christmas ever,” radioed CapCom and NASA astronaut Doug Wheelock from the ground as the spacewalkers entered the International Space Station’s Quest airlock at the end of the repair job. “We got it,” Mastracchio responded.
NASA astronaut Doug Wheelock (left) and Japanese astronaut Aki Hoshide served as CapComs during two tricky ammonia pump replacements in December 2013. Wheelock assisted Expedition 38 spacewalking astronauts Mike Hopkins and Rick Mastracchio, while Hoshide helped Japanese astronaut Koichi Wakata with robotic maneuvers. Credit: NASA TV (screenshot)
Preliminary tests show the spare pump is working perfectly. The pump is a welcome present for the six-person Expedition 38 crew, which saw a reduction in science and backup systems for two weeks after a valve in the last pump failed, causing one of the station’s two cooling loops to shut down automatically. The loops are needed to regulate the temperatures of electronics and systems on station.
The Expedition 38 crew was so quick with the repair that they finished the job in two spacewalks instead of the planned three. The astronauts fell behind the timeline today as they struggled with some of the fluid connections to the new pump, but the final steps — putting the electrical connections in place — took just minutes. The pump was brought from another location on station today, and installed into its permanent spot to help ammonia flow through the cooling system.
Anywhere between hundreds and thousands of people at NASA and international partners scrambled to put spacewalks together to fix the cooling problem after it happened. Wheelock, himself a veteran of a tricky ammonia pump repair in 2010, communicated with the spacewalkers. Japanese astronaut Aki Hoshide filled the other CapCom slot, helping Japanese astronaut Koichi Wakata who handled robotics in orbit.
Japanese astronaut Koichi Wakata controlled Canadarm2 during two spacewalks to replace a faulty ammonia pump in December 2013. Credit: NASA TV (screenshot)
Mastracchio marked his eighth spacewalk with today’s repair while Hopkins, who rode Canadarm2 for the first time in a last-minute decision, was on his second. As with a spacewalk on Saturday (Dec. 21), the astronauts reported no helmet water leaks — comforting words for agency officials who put in new procedures and parts after an incident in July. (Mastracchio experienced a water problem during repressurization Saturday that was unrelated to the first incident, and wore a backup suit today to let the primary one dry out.)
Should the ammonia pump work as planned, this clears the way for the Russians to do a spacewalk Dec. 27 to install the Urthecast high-resolution camera that will beam live views of Earth, among other tasks. Expedition 38 has the day off tomorrow (Dec. 25), NASA TV added.
The only other Christmas Eve spacewalk in NASA history took place Dec. 24, 1999 during Hubble Space Telescope servicing mission STS-103. Another Christmas Eve milestone for NASA took place 45 years ago today, when the Apollo 8 crew made a now-famous broadcast while orbiting above the moon.
Annalee Newitz, Science editior, Science Fiction author and Editor-in-chief of IO9 is offering one, free, autographed copy of her book, ‘Scatter, Adapt and Remember: How Humans will Survive a Mass Extinction.”
Now, I like post apocalyptic disaster porn as much as the next guy, but this book offers something that most of the other books, shows or movies do not to the hungry reader: hope. If human folly is one of the potential causes of the downfall of our civilization, then human ingenuity can be its saviour. This book describes both on planet, and off planet ideas that can make sure man (as a species, not a gender :)) lives to see another millennium.
About Annalee Newitz
Annalee Newitz is the founder and editor-in-chief of io9. Read more about her here.
Scatter, Adapt and Remember is available for purchase on Amazon.com.
Universe Today and Annalee Newitz are offering one free copy to win. In order to be entered into the giveaway drawing, just put your email address into the box at the bottom of this post (where it says “Enter the Giveaway”) before Tuesday, December 31st, 2013. We’ll send you a confirmation email, so you’ll need to click that to be entered into the drawing.
Before there was life as we know it, there were molecules. And after many seemingly unlikely steps these molecules underwent a magnificent transition: they became complex systems with the capability to reproduce, pass along information and drive chemical reactions. But the host of steps leading up to this transition has remained one of science’s beloved mysteries.
New research suggests that the building blocks of life — prebiotic molecules — may form in the atmospheres of planets, where the dust provides a safe platform to form on and various reactions with the surrounding plasma provide enough energy necessary to create life.
“If the formation of life is like a jigsaw puzzle — a very big and complicated jigsaw puzzle — I like to imagine prebiotic molecules as some of the individual puzzle pieces,” said St. Andrews professor Dr. Craig Stark. “Putting the pieces together you form more complicated biological structures making a clearer, more recognizable picture. And when all the pieces are in place the resulting picture is life.”
We currently think prebiotic molecules form on the tiny ice grains in interstellar space. While this may seem to contradict the readily accepted belief that life in space is impossible, the surface of the grain actually provides a nice hospitable environment for life to form as it protects molecules from harmful space radiation.
“Molecules are formed on the dust surface from the adsorption of atoms and molecules from the surrounding gas,” Stark told Universe Today. “If the appropriate ingredients to make a particular molecular compound are available, and the conditions are right, you’re in business.”
By “conditions,” Stark is hinting at the second ingredient necessary: energy. The simple molecules that populate the galaxy are relatively stable; without an incredible amount of energy they won’t form new bonds. It has been thought that life could form in lightning strikes and volcanic eruptions for this very reason.
So Stark and his colleagues turned their eyes to the atmospheres of exoplanets, where dust is immersed in a plasma full of positive ions and negative electrons. Here the electrostatic interactions of dust particles with plasma may provide the high energy necessary to form prebiotic compounds.
In a plasma the dust grain will soak up the free electrons quickly, becoming negatively charged. This is because electrons are lighter, and therefore quicker, than positive ions. Once the dust grain is negatively charged it will attract a flux of positive ions, which will accelerate toward the dust particle and collide with more energy than they would in a neutral environment.
In order to test this, the authors studied an example atmosphere, which allowed them to examine the various processes that may turn the ionized gas into a plasma as well as determine if the plasma would lead to energetic enough reactions.
“As a proof of principle we looked at the sequence of chemical reactions that lead to the formation of the simplest amino acid glycine,” Stark said. Amino acids are great examples of prebiotic molecules because they are required for the formation of proteins, peptides and enzymes.
Their models showed that “the plasma ions can indeed be accelerated to sufficient energies that exceed the activation energies for the formation of formaldehyde, ammonia, hydrogen cyanide and ultimately the amino acid glycine,” Stark told Universe Today. “This may not have been possible if the plasma was absent.”
The authors demonstrated that with modest plasma temperatures, there is enough energy to form the prebiotic molecule glycine. Higher temperatures may also enable more complex reactions and therefore more intricate prebiotic molecules.
Stark and his colleagues demonstrated a viable pathway to the formation of a prebiotic molecule, and therefore life, in seemingly common conditions. While the origin of life may remain one of science’s beloved mysteries, we continue to gain a better understanding, one puzzle piece at a time.
The paper has been accepted for publication in the journal Astrobiology and is available for download here.
China’s 1st Moon rover ‘Yutu’ embarks on thrilling adventure marking humanity’s first lunar surface visit in nearly four decades. Yutu portrait taken by the Chang’e-3 lander. Credit: CNSA/CCTV
China’s 1st Moon rover ‘Yutu’ embarks on thrilling adventure marking humanity’s first lunar surface visit in nearly four decades. Yutu portrait taken by the Chang’e-3 lander. Credit: CNSA/CCTV
See below Yutu’s departing portrait of Chang’e-3 lander emblazoned with Chinese national flag Story updated[/caption]
China’s now famous ‘Yutu’ moon rover has set sail for what promises to be breathtaking new adventures on Earth’s nearest neighbor, after completing a final joint portrait session with the Chang’e-3 lander that safely deposited her on the lunar surface only a week ago.
Yutu’s upcoming journey marks humanity’s first lunar surface visit in nearly four decades since the Soviet Union’s Luna 24 sample return vehicle visited. America’s last lunar landing mission with the Apollo 17 astronauts departed 41 years ago on Dec. 14, 1972.
The Chang’e-3 mothership and Yutu rover have resumed full operations after awakening from a sort of self induced slumber following commands from Mission Control back in Beijing.
The lander and rover finished up their 5th and final dual picture taking session – in living lunar color – on Sunday, Dec. 22, according to CCTV, China’s state run broadcast network.
“Ten pictures have been taken at five spots so far, and all of them are better than we expected,” said Wu Weiren, chief designer of the China Lunar Probe Program, to CCTV.
See the newly released portraits from photo session 5 – above and below.
The rover and lander have taken photos of each other for the fifth and final time. The back side of Chang’e 3 lander as seen by rover Yutu with Chinese national flag at left imaged for the first time. Credit: CNSA/CCTV
After arriving on the moon, Yutu and the lander took an initial pair of portraits of one another. Read my earlier report – here.
Yutu was then directed to travel in a semicircular path around the lander and to the south, making tracks several centimeters deep into the loose lunar regolith.
But within two days of the historic Dec. 14 touchdown, the two spacecraft took a four-day break that lasted from Dec. 16 to Dec. 20, during which China’s space engineers shut down their subsystems, according to China’s State Administration of Science, Technology and Industry for National Defense (SASTIND).
Portion of 1st panorama around Chang’e-3 landing site after China’s Yutu rover drove onto the Moon’s surface on Dec. 15, 2013. The images were taken by Chang’e-3 lander following Dec. 14 touchdown. Panoramic view was created from screen shots of a news video assembled into a mosaic. Credit: CNSA/CCTV/screenshot mosaics & processing by Marco Di Lorenzo/Ken Kremer See the complete panorama below
The vehicles took a ‘nap” to deal with direct solar radiation that significantly raised their temperatures. Yutu’s sunny side exceeded 100 degrees centigrade while the shaded side was simultaneously below zero, reported SASTIND.
“The break had been planned to last until Dec. 23, but the scientists decided to restart Yutu now for more research time, based on the recent observations and telemetry parameters,” said Pei Zhaoyu, spokesman for the Chinese lunar program, according to China’s Xinhua state news agency.
Both robots then snapped additional photos of one another during the traverse from each of five specific and preplanned locations.
See accompanying traverse map below – written in Chinese.
Path of Yutu rover from Dec. 14 landing to Dec. 21. Landscape textured with Chang’e 3 imagery from space and ground. Credit: CNSA/BACC
These images taken by Yutu were designed to show the 1200 kg Chang’e-3 lander from the front, side and back sides as it drove around the right side – for better illumination – at a distance of about 10 meters.
The final image of the Chang’e-3 lander taken by Yutu also captured China’s national flag emblazoned on the lander for the first time, since this was the first time it was in view of the rover’s camera eyes.
See the accompanying traverse graphic here – written in Chinese.
Yutu and the Chang’e 3 lander were scheduled to take photos of each other from locations outlined in this artists concept. Credit: China Space
Having fulfilled the last of their joint tasks, the two spacecraft can therefore each begin their own lunar exploration missions, working independently of one another exactly as planned from the outset of China’s inaugural moon landing feat.
Yutu will depart the Chang’e-3 landing zone forever and begin its own lunar trek that’s expected to last at least 3 months – and perhaps longer if it’s delicate electronic components survive the moon’s utterly harsh and unforgiving space environment.
“They will begin to conduct scientific explorations of the geography and geomorphology of the landing spot and nearby areas, and materials like minerals and elements there. We will also explore areas 30 meters and 100 meters beneath the lunar soil. The exploration will continue longer than we planned, because all the instruments and equipments are working very well,” noted Wu Weiren.
The robotic pair of spacecraft safely soft landed on the Moon on Dec. 14 at Mare Imbrium, nearby the Bay of Rainbows, or Sinus Iridum region.
Barely seven hours after the history making touchdown, ‘Yutu’ was painstakingly lowered from its perch atop the lander and then successfully drove all six wheels onto the moon’s surface on Dec. 15.
The Chang’e-3 mothership captured a panoramic view of the stark lunar terrain surrounding the spacecraft after ‘Yutu’ drove some 9 meters away from the lander.
See the eerie panoramic view of the landing site showing Yutu’s first moments on the alien lunar surface in my prior story – here.
See the dramatic video with an astronauts eye view of the lunar descent and touchdown in my prior story – here.
1st panorama around Chang’e-3 landing site after China’s Yutu rover drove onto the Moon’s surface on Dec. 15, 2013. The images were taken by Chang’e-3 lander following Dec. 14 touchdown. Panoramic view was created from screen shots of a news video assembled into a mosaic. Credit: CNSA/CCTV/screenshot mosaics & processing by Marco Di Lorenzo/Ken Kremer
The 120 kg Yutu rover is almost the size of a golf cart. It measures about 1.5 m x 1 m on its sides and stands about 1.5 m (nearly 5 feet) tall – virtually human height.
Yutu, which translates as ‘Jade Rabbit’ will use its suite of four science instruments to survey the moon’s geological structure and composition to locate the moon’s natural resources for use by potential future Chinese astronauts, perhaps a decade from now.
Stay tuned here for Ken’s continuing Chang’e-3, LADEE, MAVEN, MOM, Mars rover and more news.
Ken Kremer Landing site of Chinese lunar probe Chang’e-3 on Dec. 14, 2013. [/caption]
NASA astronaut Mike Hopkins during his first spacewalk on Dec. 21, 2013 during Expedition 38. He tweeted the next day: "Wow . . . can't believe that is me yesterday. Wish I could find the words to describe the experience, truly amazing." Credit: NASA
Two astronauts are oh-so-close to fixing the International Space Station cooling system that shut down Dec. 11. NASA astronauts Mike Hopkins and Rick Mastracchio will head “outside” on a spacewalk around 7:10 a.m. EST (12:10 p.m. UTC) to replace a faulty pump that led to the problem.
The spacewalkers were so quick on their first outing (on Saturday, Dec. 21) that they accomplished many of the tasks planned for their second spacewalk. They unhooked the first pump module and stowed it safely, then elected to wait until their second to retrieve the replacement pump, swap it in and turn it on.
Below the jump, here are some things to watch for — including why Hopkins is getting a ride on the Canadarm2 robotic arm this time instead of Mastracchio.
The suits. NASA has new safety procedures and measures in place to protect against helmet water leaks, and everything worked perfectly the first time. In an unrelated incident, while the astronauts were in the airlock, an inadvertent switch-throw introduced some water into Mastracchio’s sublimator. The suit is airing out and Mastracchio is wearing a backup suit. While sublimators need water to function, this water could have ended up in the wrong spot. If he had used the one with the water in it, it could have frozen during the second spacewalk and caused problems, Judd Frieling, the Expedition 38 lead flight director, explained on NASA TV Monday.
The background personnel. While it’s easy to shine the spotlight on the two guys outside, also remember that Japanese astronaut Koichi Wakata will be piloting the robotic arm under direction from CapCom and fellow Japanese astronaut Aki Hoshide. Giving advice to the spacewalkers will be CapCom and NASA astronaut Doug Wheelock, who did a similar repair on the International Space Station in 2010. As Wheelock told Universe Today, there are literally hundreds (likely, thousands) of people working the procedures to get this done.
The timeline. NASA really, really wants to wrap this repair up soon, and it’s not because of the holidays. Dec. 27 marks a planned spacewalk for the Russian side of the station that is totally unrelated to what is going on right now. The Americans are hoping they won’t disrupt the schedule so that the Russians can proceed with their experiment swapouts and foot restraint installation as originally planned.
Image above: Expedition 24 Flight Engineers Doug Wheelock (right) and Tracy Caldwell Dyson work to replace a failed ammonia pump module outside of the International Space Station. Credit: NASA TV
The robotic arm. Hopkins is a much more junior spacewalker than the experienced Mastracchio, who has seven spacewalks underneath his belt before today. Hopkins, who is on his first spaceflight, is in a situation where he can expect more flights in the future. So any training he can get in orbit would be fantastic as he would be a stronger asset on future missions. So, Mastracchio was supposed to ride the Canadarm2 on the second spacewalk, but at that time NASA anticipated it would take three to do the repair. Since the crew finished the work so swiftly, it’s likely only two will be needed. As such, giving Hopkins the slot would be the best practice, NASA and the crew determined.
The future pump move. NASA decided not to move the faulty pump from its temporary stowage location until later. Due to thermal conditions on station, it can stay in its temporary spot until June. This saves the spacewalkers extra work now, but someone will need to head outside by summer to move it to a more permanent location.
Why pick up a low quality, wobbly telescope from the department store when you can craft your own – just like Galileo, and all the great astronomers from history. For a minor investment, you can build a worthy telescope out of spare parts and high quality kits. Continue reading “Astronomy Cast Ep. 327: Telescope Making, Part 1: Toys and Kits”
Saturn makes a beautifully striped ornament in this natural-color image, showing its north polar hexagon and central vortex (Credit: NASA/JPL-Caltech/Space Science Institute)
Cassini couldn’t make it to the mall this year to do any Christmas shopping but that’s ok: we’re all getting something even better in our stockings than anything store-bought! To celebrate the holiday season the Cassini team has shared some truly incredible images of Saturn and some of its many moons for the world to “ooh” and “ahh” over. So stoke the fire, pour yourself a glass of egg nog, sit back and marvel at some sights from a wintry wonderland 900 million miles away…
Thanks, Cassini… these are just what I’ve always wanted! (How’d you know?)
Saturn’s southern hemisphere is growing more and more blue as winter approaches there — a coloration similar to what was once seen in the north when Cassini first arrived in 2004:
Saturn’s southern hemisphere images from a million miles away (Credit: NASA/JPL-Caltech/Space Science Institute)
(The small dark spot near the center right of the image above is the shadow of the shepherd moon Prometheus.)
Titan and Rhea, Saturn’s two largest moons, pose for Cassini:
Rhea (front) and Titan, images by Cassini in June 2011 (Credit: NASA/JPL-Caltech/Space Science Institute)
The two moons may look like they’re almost touching but in reality they were nearly half a million miles apart!
Titan’s northern “land of lakes” is visible in this image, captured by Cassini with a special spectral filter able to pierce through the moon’s thick haze:
Titan images by Cassini on Oct. 7, 2013 (Credit: NASA/JPL-Caltech/Space Science Institute)
The frozen, snowball-like surface of the 313-mile-wide moon Enceladus:
Enceladus: a highly-reflective and icy “snowball in space” (Credit: NASA/JPL-Caltech/Space Science Institute)
(Even though Enceladus is most famous for its icy geysers, first observed by Cassini in 2005, in these images they are not visible due to the lighting situations.)
Seen in a different illumination angle and in filters sensitive to UV, visible, and infrared light the many fractures and folds of Enceladus’ frozen surface become apparent:
View of the trailing face of Enceladus (Credit: NASA/JPL-Caltech/Space Science Institute)
Because of Cassini’s long-duration, multi-season stay in orbit around Saturn, researchers have been able to learn more about the ringed planet and its fascinating family of moons than ever before possible. Cassini is now going into its tenth year at Saturn and with much more research planned, we can only imagine what discoveries (and images!) are yet to come in the new year(s) ahead.
“Until Cassini arrived at Saturn, we didn’t know about the hydrocarbon lakes of Titan, the active drama of Enceladus’ jets, and the intricate patterns at Saturn’s poles,” said Linda Spilker, the Cassini project scientist at NASA’s Jet Propulsion Laboratory. “Spectacular images like these highlight that Cassini has given us the gift of knowledge, which we have been so excited to share with everyone.”
The full mosaic from the Cassini imaging team of Saturn on July 19, 2013... the "Day the Earth Smiled"
Just to demonstrate how far-reaching that Saturn snapshot of Earth this year was, the Skopje Astronomical Society (from Macedonia) made a video celebrating “The Day The Earth Smiled”, when the Cassini spacecraft looked at Earth on July 19 and thousands of people made pictures and video showing what they were doing at that time.
Watch the video, then look at some stunning pictures of Saturn below the jump.
Saturn and its rings, as seen from above the planet by the Cassini spacecraft. Credit: NASA/JPL/Space Science Institute. Assembled by Gordan Ugarkovic.
Mosaic of Saturn seen in eclipse in September 2006. Earth is the bright dot just inside the F ring at upper left. (CICLOPS/NASA/JPL-Caltech/SSI)A false-color view of Saturn’s storm, as seen through Cassini’s wide-angle camera. The blue bands at the edge are Saturn’s rings. Credit: NASA/JPL-Caltech/SSISaturn, its rings and three moons are visible in this image from Cassini. Credit: NASA/ESA
A white storm in Saturn’s northern hemisphere, as seen on Dec. 14, 2010. Credit: Anthony Wesley
