Universe Today

November 27, 2013December 23, 2015 by Shannon Hall

Second Planetary System Like Ours Discovered

A comparison between our solar system and a second solar system: KOI-351. Image Credit:

A team of European astronomers has discovered a second planetary system, the closest parallel to our own solar system yet found. It includes seven exoplanets orbiting a star with the small rocky planets close to their host star and the gas giant planets further away. The system was hidden within the wealth of data from the Kepler Space Telescope.

KOI-351 is “the first system with a significant number of planets (not just two or three, where random fluctuations can play a role) that shows a clear hierarchy like the solar system — with small, probably rocky, planets in the interior and gas giants in the (exterior),” Dr. Juan Cabrera, of the Institute of Planetary Research at the German Aerospace Center, told Universe Today.

Three of the seven planets orbiting KOI-351 were detected earlier this year, and have periods of 59, 210 and 331 days — similar to the periods of Mercury, Venus and Earth.

But the orbital periods of these planets vary by as much as 25.7 hours. This is the highest variation detected in an exoplanet’s orbital period so far, hinting that there are more planets than meets the eye.

In closely packed systems, the gravitational pull of nearby planets can cause the acceleration or deceleration of a planet along its orbit. These “tugs” cause the variations in orbital periods.

They also provide indirect evidence of further planets. Using advanced computer algorithms, Cabrera and his team detected four new planets orbiting KOI-351.

But these planets are much closer to their host star than Mercury is to our Sun, with orbital periods of 7, 9, 92 and 125 days. The system is extremely compact — with the outermost planet having an orbital period less than the Earth’s. Yes, the entire system orbits within 1 AU.

While astronomers have discovered over 1000 exoplanets, this is the first solar system analogue detected to date. Not only are there seven planets, but they display the same architecture — rocky small planets orbiting close to the sun and gas giants orbiting further away — as our own solar system.

Most exoplanets are strikingly different from the planets in our own solar system. “We find planets in any order, at any distance, of any size; even planetary classes that don’t exist in the solar system,” Cabrera said.

Several theories including planet migration and planet-planet scattering have been proposed to explain these differences. But the fact of the matter is planet formation is still poorly understood.

“We don’t know yet why this system formed this way, but we have the feeling that this is a key system in understanding planetary formation in general and the formation of the solar system in particular,” Cabrera told Universe Today.

The team is extremely hopeful that the upcoming mission PLATO will receive funding. If so, it will allow them to take a second look at this system — determining the radius and mass of each planet and even analyzing their compositions.

Follow-up observations will not only allow astronomers to determine how this planetary system formed, it will provide hints as to how our own solar system formed.

The paper has been accepted for publication in the Astrophysical Journal and is available for download here.

November 26, 2013December 30, 2015 by Jason Major

Watch This Asteroid Not Hit Earth

Earlier today the near-Earth asteroid 2013 NJ sailed by, coming as close as 2.5 lunar distances — about 960,000 km/596,500 miles. That’s a relatively close call, in astronomical terms, but still decidedly a miss (if you hadn’t already noticed.) Which is a good thing since 2013 NJ is estimated to be anywhere from 120–260 meters wide (400-850 feet) and would have caused no small amount of damage had its path intersected ours more intimately.

Luckily that wasn’t the case, and instead we get watch 2013 NJ as it harmlessly passes by in the video above, made from images captured by “shadow chaser” Jonathan Bradshaw from his observatory in Queensland, Australia. Nice work, Jonathan!

Keep tabs on known near-Earth objects on the JPL close pass page here.

November 26, 2013December 23, 2015 by Nancy Atkinson

Incredible Astrophoto: Deep and Wide View of the Milky Way

An annotated version of a deep-sky wide field view of our own galaxy, the Milky Way. Credit and copyright: Miguel Claro.

This new panorama of the Milky Way by astrophotographer Miguel Claro is really amazing, and you definitely want to click on the image to have access to larger versions! This is an 18-image mosaic taken with a Canon 60Da, with 60 second exposures, and it rivals wide-field images taken by larger ground-based telescopes. The images, were, however, taken from the home of some of the darkest skies and largest telescopes in the world, near Roque de Los Muchahos, in La Palma, Canary Islands. Visible is the hazy band of white light that comes from unresolved stars and other material that lie within the galactic plane, contrasting with interesting shapes within the dark regions of the band, corresponding to areas where light from distant stars is blocked by interstellar dust.

Above is an annotated version of Claro’s panorama, and below is one without annotations. Claro provides a detailed description at his website, and also has a beautiful gallery of images from his visit to La Palma which includes pictures of many of the telescopes at night, backdropped by star fields and the night sky.

Thanks to Miguel Claro for sharing his images with Universe Today!

The Milky Way Galaxy – Deep Sky Wide Field view, captured from Los Andenes, near Roque de Los Muchahos, in La Palma, Canary Island. Credit and copyright: Miguel Claro.

Want to get your astrophoto featured on Universe Today? Join our Flickr group or send us your images by email (this means you’re giving us permission to post them). Please explain what’s in the picture, when you took it, the equipment you used, etc.

November 26, 2013December 23, 2015 by Elizabeth Howell

Home Computers Discover Gamma-Ray Pulsars

Gamma-ray pulsars in the Milky Way's plane, found by volunteers using Einstein@Home. The sky map is from Fermi's Large Area Telescope. The brighter the color you see, the more intense the radiation in that spot. The small flags show the nationality of the volunteers whose computers spotted the pulsars. Credit: Knispel/Pletsch/AEI/NASA/DOE/Fermi LAT Collaboration

Imagine that you’re innocently running your computer in pursuit of helping data crunch a huge science project. Then, out of the thousands of machines running the project, yours happens to stumble across a discovery. That’s what happened to several volunteers with Einstein@Home, which seeks pulsars in data from the Fermi Gamma-Ray Space Telescope, among other projects.

“At first I was a bit dumbfounded and thought someone was playing a hoax on me. But after I did some research,” everything checked out. That someone as insignificant as myself could make a difference was amazing,” stated Kentucky resident Thomas M. Jackson, who contributed to the project.

Pulsars, a type of neutron star, are the leftovers of stars that exploded as supernovae. They rotate rapidly, with such precision in their rotation periods that they have sometimes been likened to celestial clocks. Although the discovery is exciting to the eight volunteers because they are the first to find these gamma-ray pulsars as part of a volunteer computing project, the pulsars also have some interesting scientific features.

Artist's illustration of a neutron star, a tiny remnant that remains after its predecessor star explodes. Here, the 12-mile (20-kilometer) sphere is compared with the size of Hannover, Germany. Credit: NASA's Goddard Space Flight Center — Artist’s illustration of a neutron star, a tiny remnant that remains after its predecessor star explodes. Here, the 12-mile (20-kilometer) sphere is compared with the size of Hannover, Germany. Credit: NASA’s Goddard Space Flight Center

The four pulsars were discovered in the plane of the Milky Way in an area that radio telescopes had looked at previously, but weren’t able to find themselves. This means that the pulsars are likely only visible in gamma rays, at least from the vantage point of Earth; the objects emit their radiation in a narrow direction with radio, but a wider stripe with gamma rays. (After the discoveries, astronomers used the Max Planck Institute for Radio Astronomy’s 100-meter Effelsberg radio telescope and the Australian Parkes Observatory to peer at those spots in the sky, and still saw no radio signals.)

Two of the pulsars also “hiccup” or exhibit a pulsar glitch, when the rotation sped up and then fell back to the usual rotation period a few weeks later. Astronomers are still learning more about these glitches, but they do know that most of them happen in young pulsars. All four pulsars are likely between 30,000 and 60,000 years old.

Artist's conception of a gamma-ray pulsar. Gamma rays are shown in purple, and radio radiation in green. Credit: NASA/Fermi/Cruz de Wilde — Artist’s conception of a gamma-ray pulsar. Gamma rays are shown in purple, and radio radiation in green. Credit: NASA/Fermi/Cruz de Wilde

“The first-time discovery of gamma-ray pulsars by Einstein@Home is a milestone – not only for us but also for our project volunteers. It shows that everyone with a computer can contribute to cutting-edge science and make astronomical discoveries,” stated co-author Bruce Allen, principal investigator of Einstein@Home. “I’m hoping that our enthusiasm will inspire more people to help us with making further discoveries.”

Einstein@Home is run jointly by the Center for Gravitation and Cosmology at the University of Wisconsin–Milwaukee and the Albert Einstein Institute in Hannover, Germany. It is funded by the National Science Foundation and the Max Planck Society. As for the volunteers, their names were mentioned in the scientific literature and they also received certificates of discovery for their work.

Source: Max Planck Institute for Gravitational Physics

November 26, 2013December 23, 2015 by Elizabeth Howell

How Could We Recycle Satellites For Newer Missions?

Artist's conception of ESA's OTS-2 telecom satellite, which was retired from geostationary orbit in 1991 after nearly 13 years of service. Credit: ESA

Space junk is an ongoing concern for NASA, the European Space Agency and many others. After satellites live out their useful lives in orbit, more and more the agencies are trying to either move them far away from Earth, or to have the satellites burn up in the atmosphere. That’s basically to preserve orbital slots around the planet for others, and to reduce the risk of collisions.

But here’s an alternate approach — why not leave a few satellites handy for other missions to pick up? ESA recently opened a tender exploring this idea, and put a few thoughts out in a press release. Maybe leftover solid rocket fuel could be re-used. Metal alloys could be ground down for potential 3-D printing materials. Life support systems could use biodegradable materials. Since it costs so much to haul stuff into orbit, maybe it might be worthwhile to leave some available for future missions, ESA reasons.

Image plot of space junk. Image credit: NASA

“ESA’s new invitation for ‘Sustainable Materials Concepts’ is seeking companies to study various concepts of this approach, including considering the kinds of materials that could be reused as biological or technical nutrients – serving as resources for new other processes,” ESA stated.

“Also under consideration: what sustainable materials might replace current space-grade materials such as titanium and aluminium alloys or carbon-fibre epoxy resins? And how might the use of materials as biological or technical nutrients work in practice?”

What do you think satellites could be used for? Leave your thoughts in the comments.

November 26, 2013December 23, 2015 by Elizabeth Howell

NASA Plans To Deepen Asteroid Searches With Planetary Resources

An artist's conception of two tidally locked objects orbiting the Sun from afar. The system: 2010 WG9 may likely look like this. Credit: zmescience

Planetary Resources Inc. — that company that is developing a crowdsourced space telescope to search for asteroids — is planning to work on “crowdsourced software solutions” to make it easier to find asteroids and other near-Earth objects, using NASA-funded data.

NASA announced that Planetary Resources will receive a non-reimbursable Space Act Agreement to help NASA characterize near-Earth objects. It’s the first initiative announced under NASA’s Asteroid Grand Challenge, which the agency announced this summer as a vehicle to find threats to Earth.

A contest is planned in 2014 that will also include participation from the Zooniverse’s forthcoming Asteroid Zoo platform (which includes participation from Planetary Resources). Zooniverse is known for providing ordinary people the chance to participate in astronomical searches, including galaxies and asteroid features.

NASA’s role will be to “develop and manage” the contest, while Planetary Resources is expected to “facilitate the use of NASA-funded sky survey data and help support the algorithm competition and review results,” the agency stated.

NASA is trying mightily to move forward with its plans to capture an explore an asteroid in the next few years, but there’s no guarantee that the agency will receive the funds it wants for it in the fiscal 2014 budget. Politicians have expressed concern that the mission is not interesting the public; besides which, the agency is already battling for funds for its commercial crew and planetary science programs, among others.

Source: NASA

November 25, 2013December 29, 2015 by Susie Murph

Carnival of Space #329

This week’s Carnival of Space is hosted by our pal Ray Sanders at his Dear Astronomer blog.

Click here to read Carnival of Space #329.

And if you’re interested in looking back, here’s an archive to all the past Carnivals of Space.

If you’ve got a space-related blog, you should really join the carnival. Just email an entry to [email protected], and the next host will link to it. It will help get awareness out there about your writing, help you meet others in the space community – and community is what blogging is all about. And if you really want to help out, sign up to be a host. Send an email to the above address.

November 25, 2013December 28, 2015 by Fraser Cain

Astronomy Cast 323: Isotopes

The number of protons defines an element, but the number of neutrons can vary. We call these different flavors of an element isotopes, and use these isotopes to solve some challenging mysteries in physics and astronomy. Some isotopes occur naturally, and others need to be made in nuclear reactors and particle accelerators.

Continue reading “Astronomy Cast 323: Isotopes”

November 25, 2013December 23, 2015 by Ken Kremer

Elon Musk Briefs Universe Today & Media ahead of Revolutionary Falcon 9 Blastoff

SpaceX founder and CEO Elon Musk briefs reporters including Universe Today in Cocoa Beach, FL prior to SpaceX Falcon 9 rocket blastoff with SES-8 communications satellite on Dec 3, 2013 from Cape Canaveral, FL. Credit: Ken Kremer/kenkremer.com

SpaceX founder and CEO Elon Musk briefs reporters including Universe Today on Sunday (Nov. 24) in Cocoa Beach, FL prior to planned SpaceX Falcon 9 rocket blastoff with SES-8 communications satellite set for Nov. 25, 2013 from Cape Canaveral, FL. Credit: Ken Kremer/kenkremer.com
See live SpaceX webcast link below[/caption]

CAPE CANAVERAL, FL – A new space era potentially dawns today, Nov. 25, with the planned maiden launch of the next generation SpaceX Falcon 9 commercial rocket from Cape Canaveral, FL, that could completely revolutionize how we access the high frontier and “rock the space industry to its core” by cutting cost and production times – if all goes well.

Just a day before liftoff, SpaceX founder and CEO Elon Musk personally briefed reporters including Universe Today on Sunday (Nov. 24) in Cocoa Beach, FL, nearby the firms Cape Canaveral launch facility about today’s (Nov. 25) upcoming maiden launch of the companies upgraded Falcon 9 rocket, saying it was “very important” for the future.

“This launch is very important to the future of SpaceX. This is our toughest mission yet!” said Musk to a small group of reporters, including the author, gathered for Sunday’s exclusive pre-launch briefing.

“Whether or not this launch is successful, I’m confident we will certainly make it on some subsequent launch,” said Musk at the Cocoa Beach meeting with the media.

The Falcon 9 liftoff from Launch Complex 40 at Cape Canaveral, FL is scheduled for 5:37pm EST and will be webcast live by SpaceX for viewing at; www.spacex.com/webcast

Today’s (Nov. 25) inaugural blastoff of the privately developed Falcon 9 rocket with the commercial SES-8 HDTV and telecommunications satellite is especially noteworthy because it also features SpaceX’s first ever launch of any satellite to a Geostationary Transfer Orbit (GTO).

From the start, SpaceX designed the Falcon 9 rocket from a clean sheet aimed at radically reducing production and manufacturing costs and assembly times and thereby offer significantly lower launch price, says Musk.

“I don’t want to tempt fate, but I think it’s going to have a pretty significant impact on the world launch market and on the launch industry because our prices are the most competitive of any in the world,” Musk stated.

SpaceX founder and CEO Elon Musk (right) and Martin Halliwell (left), SES chief technical officer briefs reporters including Universe Today on Sunday (Nov. 24) in Cocoa Beach, FL prior to planned SpaceX Falcon 9 rocket blastoff with SES-8 communications satellite set for Nov. 25, 2013 from Cape Canaveral, FL. Credit: Ken Kremer/kenkremer.com

SES-8 also represents SpaceX’s first launch of a Falcon 9 carrying a commercial satellite to space from the Florida Space Coast.

“This is really rocking the industry. Everybody has to look out,” said Martin Halliwell, SES chief technical officer, who joined Musk at Sunday’s meeting.

The 3,138 kg (6,918 lbs) SES-8 satellite is a hybrid Ku- and Ka-band spacecraft that will provide TV and communications coverage for the South Asia and Asia Pacific regions.

The SES-8 spacecrft was built by Orbital Sciences Corp and will be lofted to a 295 x 80,000 km geosynchronous transfer orbit inclined 20.75 degrees.

SpaceX has signed nearly 50 commercial and government launch contracts and thus already sports a very crowded launch manifest ahead of today’s Falcon 9 launch.

All five launches of SpaceX’s Falcon 9 rocket from Space Launch Complex 40 at Cape Canaveral Air Force Station were either test launches or flights to the International Space Station, under contract to NASA.

The five Falcon 9 launches to date from the Florida Space Coast also featured the original, less powerful and shorter version of the booster and has a 100% success rate.

This mighty new version of the Falcon 9 dubbed v1.1 is powered by a cluster of nine of SpaceX’s new Merlin 1D engines that are about 50% more powerful compared to the standard Merlin 1C engines. The nine Merlin 1D engines 1.3 million pounds of thrust at sea level that rises to 1.5 million pounds as the rocket climbs to orbit.

Next Generation SpaceX Falcon 9 rocket with SES-8 communications satellite awaits launch from Pad 40 at Cape Canaveral, FL. Credit: Ken Kremer/kenkremer.com

Therefore the upgraded Falcon 9 can boost a much heavier cargo load to the ISS, low Earth orbit, geostationary orbit and beyond.

The next generation Falcon 9 is a monster. It measures 224 feet tall and is 12 feet in diameter. That compares to 13 stories for the original Falcon 9.

The payload fairing for SES-8 is 17 feet in diameter.

The Falcon 9/SES-8 launch window extends for 66 minutes until 6:43 p.m. EST.
Weather outlook is 80% favorable at this time.

SpaceX is planning a live webcast of the launch with commentary from SpaceX corporate headquarters in Hawthorne, CA.

The broadcast will begin at approximately 5:00 p.m. EDT and include detailed discussions about the Falcon 9 rocket, launch and flight sequences as well as about the SES-8 satellite.

Stay tuned here for continuing SpaceX & MAVEN news and Ken’s SpaceX launch reports from on site at Cape Canaveral & the Kennedy Space Center press site.

Ken Kremer

…………….

Learn more about SpaceX, LADEE, MAVEN, MOM, Mars rovers, Orion and more at Ken’s upcoming presentations

Nov 22-25: “SpaceX launch, MAVEN Mars Launch and Curiosity Explores Mars, Orion and NASA’s Future”, Kennedy Space Center Quality Inn, Titusville, FL, 8 PM

Dec 11: “Curiosity, MAVEN and the Search for Life on Mars”, “LADEE & Antares ISS Launches from Virginia”, Rittenhouse Astronomical Society, Franklin Institute, Phila, PA, 8 PM

Falcon 9 SpaceX CRS-2 launch on March 1, 2013 to the ISS from Cape Canaveral, Florida.- shot from the roof of the Vehicle Assembly Building. Credit: Ken Kremer/www.kenkremer.com

November 25, 2013March 16, 2017 by Fraser Cain

Are There More Grains of Sand Than Stars?

This question comes from Sheldon Grimshaw. “I’ve heard that there are more stars in our Universe than there are grains of sand on all the beaches on Earth. Is this possible?” Awesome question, and a great excuse to do some math.

As we learned in a previous video, there are 100 to 400 billion stars in the Milky Way and more than 100 billion galaxies in the Universe – maybe as many as 500 billion. If you multiply stars by galaxies, at the low end, you get 10 billion billion stars, or 10 sextillion stars in the Universe – a 1 followed by 22 zeros. At the high end, it’s 200 sextillion.

These are mind bogglingly huge numbers. How do they compare to the number of grains of sand on the collective beaches of an entire planet? This type of sand measures about a half millimeter across.

You could put 20 grains of sand packed in side-by-side to make a centimeter. 8000 grains in one cubic centimeter. If you took 10 sextillion grains of sand, put them into a ball, it would have a radius of 10.6 kilometers. And for the high end of our estimate, 200 sextillion, it would be 72 kilometers across. If we had a sphere bigger than the Earth, it would be an easy answer, but no such luck. This might be close.

So, is there that much sand on all the beaches, everywhere, on this planet? You’d need to estimate the average volume of a sandy beach and the average amount of the world’s coastlines which are beaches.

I’m going to follow the estimates and calculations made by Dr. Jason Marshall, aka, the Math Dude. According to Jason, there about 700 trillion cubic meters of beach of Earth, and that works out to around 5 sextillion grains of sand.

Jason reminds us that his math is a rough estimate, and he could be off by a factor of 2 either way. So it could be 2.5 sextillion or there could be 10 sextillion grains of sand on all the world’s beaches.

So, if the low end estimate for the number of stars matches the high end estimate for the number of grains of sand, it’s the same. But more likely, there are 5 to 10 times more stars than there are grains of sand on all the world’s beaches.

So, there’s your answer, Sheldon. For some “back of the napkin” math we can guess that there are more stars in our Universe than there are grains of sand on all the beaches of Earth.

Oh, one more thing. Instead of grains of sand, what about atoms? How big is 10 sextillion atoms? How huge would something with that massive quantity of anything be? Pretty gigantic. Well, relatively at least. 10 sextillion of anything does sound like a whole lot.

If you were to make a pile of that many atoms… guess how big it would be. It’d be about…. (gesture big then gesture small) 4 times smaller than a dust mite. Which means, a single grain of sand has more atoms than there are stars in the Universe.