Universe Today

January 22, 2014December 23, 2015 by Bob King

Bright New Supernova Blows Up in Nearby M82, the Cigar Galaxy

Before and after photos of the bright galaxy M81 showing the appearance of a brand new supernova. The object is located 54" west and 21" south of the galaxy's center. Credit: E. Guido, N. Howes, M. Nicolini

Wow! Now here’s a supernova bright enough for even small telescope observers to see. And it’s in a bright galaxy in Ursa Major well placed for viewing during evening hours in the northern hemisphere. Doesn’t get much better than that! The new object was discovered last night by S.J. Fossey; news of the outburst first appeared on the Central Bureau for Astronomical Telegrams “Transient Objects Confirmation Page”

An animation showing a comparison between the confirmation image of supernova in M82 by the team from the Remanzacco Observatory and archive image by a 2-meter telescope FTN - LCOGT from November 22, 2013. Click on the image for a larger version. Credit: E. Guido, N. Howes, M. Nicolini. — An animation showing a comparison between the confirmation image of supernova in M82 by the team from the Remanzacco Observatory and archive image by a 2-meter telescope FTN – LCOGT from November 22, 2013. Click on the image for a larger version. Credit: E. Guido, N. Howes, M. Nicolini.

Astronomers are saying this new supernova is currently at magnitude +11 to +12, so its definitely not visible with the naked eye. You’ll need a 4 inch telescope at least to be able to see it. That said, at 12 million light years away, this is (at the moment) the brightest, closest supernova since SN 1993 J kaboomed in neighboring galaxy M81 21 years ago in 1993. M81 and M82, along with NGC 3077, form a close-knit interacting group.

Galaxy M81 with the new bright supernova photographed earlier today. Credit: Leonid Elenin — Another view of the galaxy M82 with the new bright supernova photographed earlier today. M82 glows at magnitude 8.4 and a popular object for telescopes of every size. Credit: Leonid Elenin

It’s amazing it wasn’t found and reported sooner (update — see below, as perhaps it was!). M82 is a popular target for beginning and amateur astronomers; pre-discovery observations show it had already brightened to magnitude 13.9 on the 16th, 13.3 on the 17th and 12.2 on the 19th. Cold winter weather and clouds to blame?

This is the starburst galaxy M82 imaged by Hubble in 2006, with approximate location of the new supernova noted. Image credit: NASA/ESA and the Hubble Heritage team, image notation by Jason Major.

M82 is a bright, striking edge-on spiral galaxy bright enough to see in binoculars. Known as the Cigar or Starburst Galaxy because of its shape and a large, active starburst region in its core, it’s only 12 million light years from Earth and home to two previous supernovae in 2004 and 2008. Neither of those came anywhere close to the being as bright as the discovery, and it’s very possible the new object will become brighter yet.

Evolution of a Type Ia supernova. A superdense white dwarf star draws matter from a companion star, reaches a critical limit and then burns catastrophically. Credit: NASA/CXC/M. Weiss

PSN J09554214+6940260 is a Type Ia supernova. Type Ia (one-a), a dry term describing one of the most catastrophic events in the universe. Here a superdense white dwarf, a star only about the size of Earth but with the gravitational power of a sun-size star, pulls hydrogen gas from a nearby companion down to its surface where it adds to the star’s weight.

When the dwarf packs enough pounds to reach a mass 1.4 times that of the sun, it can no longer support itself. The star suddenly collapses, heats to incredible temperatures and burns up explosively in a runaway fusion reaction. What we see here on Earth is the sudden appearance of a brand new star within the galaxy’s disk. Of course, it’s not really a new star, but rather the end of an aged one.

This map shows the sky facing north-northeast at 8 p.m. local time in late January. The supernova is located about a fist above the Dipper Bowl in M82. Right next store is the equally bright M81 galaxy. It's easy to tell them apart. M81 is round with a bright core compared the streak-like appearance of M82. Stellarium — This map shows the sky facing north-northeast at 8 p.m. local time in late January. The supernova is located about a “fist” above the Dipper Bowl in M82. Right next door is the equally bright M81 galaxy. It’s easy to tell them apart. M81 is round with a bright core; M82 looks like a streak mark. See detailed map below. Stellarium

I know you’re as excited as I am to get a look at this spectacular new star the next clear night, so I’ve prepared a couple maps to help you find the galaxy. The best time to see the supernova is as soon as the sky gets dark when it’s already up in the northeastern sky above the Dipper Bowl, but since it’s circumpolar for mid-latitude observers, you can check it out any time of night.

To find M82, look about 7 degrees (not quite a fist held at arm's length) above the Bowl to find 23 UMa, an easy naked eye star. From there you can star hop to a little triangle and over to a pair of stars (the "line"). M82 and M81 are about half a degree below the line. Stellarium — To find M82, look about 7 degrees (not quite a fist held at arm’s length) above the Bowl to find 23 UMa, an easy naked eye star. From there you can star hop to a little triangle and over to a pair of stars (the “line”). M82 and M81 are about half a degree below the line. Stellarium

My maps show its position for around 8 o’clock. When you dial in the galaxy in your telescope, look for a starry point along its long axis west and south of the nucleus. All the fury of this fantastic blast is concentrated in that meek spark of light glimmering in the galactic haze.

Good luck and enjoy watching one of the biggest show of fireworks the universe has to offer. We’ll keep you posted with the latest updates right here. For more photos and additional information, please see David Bishop’s excellent Latest Supernovae site. For charts with magnitudes to follow the supernova’s progress, visit the AAVSO’s Variable Star Plotter and type in ‘PSN J09554214+6940260’ for the star’s name. You can read more about the followup work by the Remanzacco Observatory team here.

UPDATE: Sketch of M82 and its supernova, now designated SN 2014J, made at 9 p.m. CST Jan. 22 with a 15-inch (37 cm) telescope. A perfect arc of 3 stars (left) takes you right to it. The object is the only bright star shining in the galaxy. The supernova had brightened to about magnitude 11 at this time. Amazingly easy to see. Credit: Bob King — UPDATE: Sketch of M82 and its supernova, now designated SN 2014J, made at 9 p.m. CST Jan. 22 with a 15-inch (37 cm) telescope. A perfect arc of 3 stars (left) takes you right to it. The object is the only bright star shining in the galaxy. Amazingly easy to see. Numbers shown are magnitudes from the AAVSO – use them to help you gauge 2014J’s brightness changes. Credit: Bob King

UPDATE: Fraser and team from the Virtual Star Party actually imaged M82 on Sunday evening, and you can see it in the video below at the 22 minute mark. It really looks like a bright spot is showing up — and that’s about a day before it was announced. Did they catch it? In the video the galaxy appears upside down as compared to the images here:

UT reader Andrew Symes took a screenshot from the VSP, flipped it, and compared it with photo from Meineko Sakura from the Tao Astronomical Observatory it really appears the team caught the supernova before it was actually announced! Take a look:

Screenshot from the January 19 Virtual Star Party (right) compared to image from Meineko Sakura of the Tao Astronomical Observatory of the new supernova.

January 22, 2014December 23, 2015 by Ken Kremer

China’s Yutu rover trundles across the Moon in Time-lapse Panorama

This time-lapse color panorama from China’s Chang’e-3 lander shows the Yutu rover at two different positions during its trek over the Moon’s surface at its landing site from Dec. 15-18, 2013. This view was taken from a 360-degree panorama – see below.
Credit: CNSA/Chinanews/Ken Kremer/Marco Di Lorenzo
Story updated
This mosaic was selected as Astronomy Picture of the Day (APOD) on Feb. 3, 2014
http://apod.nasa.gov/apod/ap140203.html[/caption]

A new time-lapse photomosaic shows China’s Yutu rover dramatically trundling across the Moon’s stark gray terrain in the first week after she rolled all six wheels onto the desolate lunar plains.

Our complete time-lapse mosaic (see below) shows Yutu at three different positions trekking around the landing site, and gives a real sense of how it is maneuvering around – on the 1st Lunar Day.

The 360-degree panoramic mosaic was created from images captured by the color camera aboard China’s Chang’e-3 lander, the country’s first spacecraft to successfully soft land on the Moon.

The time-lapse mosaic was stitched together by the imaging team of scientists Ken Kremer and Marco Di Lorenzo using images just released on a Chinese language website.

We integrated the wide screen panorama with additional images of Yutu taken by the lander as she roved around the right side of the mothership during her 1st Lunar Day – to create the new time-lapse panorama.

To me the moonscape is rather reminiscent of the scenery from NASA’s manned Apollo lunar landing missions which took place over 4 decades ago – from 1969 to 1972.

360-degree time-lapse color panorama from China’s Chang’e-3 lander This 360-degree time-lapse color panorama from China’s Chang’e-3 lander shows the Yutu rover at three different positions during its trek over the Moon’s surface at its landing site from Dec. 15-22, 2013 during the 1st Lunar Day. Credit: CNSA/Chinanews/Ken Kremer/Marco Di Lorenzo – kenkremer.com

Our time-lapse Yutu mosaic was initially featured at NBC News by Alan Boyle – here.

Here’s the original 360 degree panorama:

1st 360 Degree Color Panorama from China’s Chang’e-3 Lunar Lander. This 1st color panorama from Chang’e-3 lander shows the view all around the landing site after the ‘Yutu’ lunar rover left impressive tracks behind when it initially rolled all six wheels onto the pockmarked and gray lunar terrain on Dec. 15, 2013. Mosaic Credit: CNSA/Chinanews/Ken Kremer/Marco Di Lorenzo – kenkremer.com

The first portrait of Yutu was taken shortly after it first drove off the 1200 kg Chang’e-3 lander on Dec. 15. The last Yutu position shows her heading off to the south and departing the landing site forever.

She’s not ever coming back to see the stationary lander again, according to China’s Chang’e-3 mission team.

Yutu, which translates as ‘Jade Rabbit’, is on her own from now on.

This composite view shows China’s Yutu rover heading south and away forever from the Chang’e-3 landing site about a week after the Dec. 14, 2013 touchdown at Mare Imbrium. This cropped view was taken from the 360-degree panorama. See complete 360 degree landing site panorama below. Chang’e-3 landers extreme ultraviolet (EUV) camera is at right, antenna at left. Credit: CNSA/Chinanews/Ken Kremer/Marco Di Lorenzo – kenkremer.com — This composite view shows China’s Yutu rover heading south and away forever from the Chang’e-3 landing site about a week after the Dec. 14, 2013 touchdown at Mare Imbrium. This cropped view was taken from the 360-degree panorama. See complete 360 degree landing site panorama herein. Chang’e-3 landers extreme ultraviolet (EUV) camera is at right, antenna at left. Credit: CNSA/Chinanews/Ken Kremer/Marco Di Lorenzo – kenkremer.com

Chang’e-3 safely touched down on the Moon at Mare Imbrium near the Bay of Rainbows on Dec. 14, 2013.

Seven hours later, the piggybacked 140 kg Yutu robot drove off a pair of ramps, onto the Moon and into the history books.

Here is the initial black and white panoramic version from the Chang’e-3 navigation camera – which we assembled from screenshots taken as it was twirling about in a CCTV news video report.

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 Chang’e-3 mothership and Yutu rover are now working during their 2nd Lunar Day, having survived the harsh extremes of their 1st Lunar Night when temperatures plummeted to below minus 180 degrees Celsius, or minus 292 degrees Fahrenheit.

They have resumed full operation and are conducting research investigations. Each is equipped with four science instruments.

All the equipment is functioning well except alas for the color camera used to snap the images for the photomosaics herein.

Photo of Chang'e-3 moon lander emblazoned with Chinese national flag taken by the panoramic camera on the Yutu moon rover on Dec. 22, 2013. Credit: CNSA — Photo of Chang’e-3 moon lander emblazoned with Chinese national flag taken by the panoramic camera on the Yutu moon rover on Dec. 22, 2013. Credit: CNSA

China’s official Xinhua new agency reports that the instruments aboard the lander and rover have each collected a large amount of data about the Moon, Earth and celestial objects.

Scientists have created a star atlas around the constellation Draco and used the ground penetrating radar to survey the moon’s subsurface and soil structure to depths of 10 to 140 meters.

Meanwhile as China’s Yutu rover trundles across pitted moonscapes, NASA’s Opportunity rover is in the midst of Martian mountaineering at the start of Decade 2 on the Red Planet and younger sister Curiosity is speeding towards the sedimentary layers of Mount Sharp.

Stay tuned here for Ken’s continuing Chang’e-3, Orbital Sciences, SpaceX, commercial space, LADEE, Mars and more news.

Ken Kremer

Traverse 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 — Traverse 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

January 21, 2014December 23, 2015 by Nancy Atkinson

Latest Data Shows Global Climate Continues Warming Trend

Chart of the temperature anomalies for 1950-2013, also showing the phase of the El Niñ0-La Niña cycle. (Image Credit: NASA/GSFC/Earth Observatory, NASA/GISS)

The latest statistics are in from 2013 and both NASA’s and NOAA’s measurements of global temperatures show Earth continued to experience temperatures warmer than those measured several decades ago.

NASA scientists say 2013 tied with 2009 and 2006 for the seventh warmest year since 1880, continuing a long-term trend of rising global temperatures, while NOAA – which uses a different method of analyzing temperature data – said that 2013 tied with 2003 as 4th-warmest year globally since 1880.

“The long-term trends are very clear, and they’re not going to disappear,” said climatologist Gavin Schmidt from NASA’s Goddard Institute for Space Studies (GISS). “It isn’t an error in our calculations.”

Land and ocean global temperatures in 2013 from both NASA and NOAA. Via NASA.

NASA data shows that since 1950, average temperatures have increased 1.1°F to an average of 58.3° in 2013.

NOAA data shows the average temperature across global land and ocean surfaces was 1.12 degrees above the 20th-century average. This is the 37th consecutive year that the annual temperature was above the long-term average.

This coincides with another recent study that showed the so-called “pause” in global warming is not happening, and that the temperatures over the past 15 years are still on the rise.

Both NASA and NOAA scientists say the increase in greenhouse gas levels continue to drive the temperature increase.

Additionally, with the exception of 1998, the 10 warmest years in the 134-year record all have occurred since 2000, with 2010 and 2005 ranking as the warmest years on record.

NASA says the average temperature in 2013 was 58.3 degrees Fahrenheit (14.6 Celsius), which is 1.1 F (0.6 C) warmer than the mid-20th century baseline. The average global temperature has risen about 1.4 degrees F (0.8 C) since 1880, according to the new analysis. Exact rankings for individual years are sensitive to data inputs and analysis methods.

“Long-term trends in surface temperatures are unusual and 2013 adds to the evidence for ongoing climate change,” GISS climatologist Gavin Schmidt said. “While one year or one season can be affected by random weather events, this analysis shows the necessity for continued, long-term monitoring.”

Scientists emphasize that weather patterns always will cause fluctuations in average temperatures from year to year, but the continued increases in greenhouse gas levels in Earth’s atmosphere are driving a long-term rise in global temperatures. Each successive year will not necessarily be warmer than the year before, but with the current level of greenhouse gas emissions, scientists expect each successive decade to be warmer than the previous.

An Incredible Time-lapse of Venus Passing Through Inferior Conjunction

Some of the most amazing celestial sights are hidden from our view in the daytime sky. Or are they? We recently challenged readers to try and follow the planet Venus through inferior conjunction as it passed between the Earth and the Sun on January 11^th. Unlike the previous pass on June 6^th, 2012 when Venus made its last transit of the Sun for the 21^st century, the 2014 solar conjunction offered an outstanding chance to trace Venus’s path just five degrees from the Sun from the dusk and into the dawn sky.

Expert astrophotographers Shahrin Ahmad based in Sri Damansara, Malaysia and Paul Stewart observing from New Zealand took up that daily challenge as Venus neared the limb of the Sun, with amazing results. Now, Shahrin has also produced an amazing time-lapse sequence of Venus passing through inferior conjunction.

You can actually see the illuminated “horns” of Venus as they thin, extend, and rotate around the limb as the planet passes the Sun.

And it’s what’s more incredible is that the capture was completed in the daytime. But such a feat isn’t for the unskilled. Shahrin told Universe Today of the special safety precautions he had to take to acquire Venus so close to the Sun:

“Since Venus was getting closer each day towards conjunction, I found it far too dangerous to find visually, either using the main telescope or the finderscope.”

Instead, Shahrin relies on computerized software named Cartes du Ciel to drive his Skywatcher EQ6 mount and pinpoint Venus in the daytime sky.

“The sky in Kuala Lumpur is never clear from here, thus it rarely appears dark blue, making it almost impossible to spot Venus visually, especially when it is less than 10 degrees from the Sun.”

Shahrin elaborated further on his special solar safety precautions:

“I always start with all covers in place and the solar filter on the main telescope. I will slew the telescope to the Sun, make some slight repositioning adjustments, and then synchronize the telescope to the new position. After ensuring the Sun is visible and centered on the computer screen, I slew to Venus. Once the mount has stopped in position, I remove the solar filter and replace it with a makeshift cardboard extender mounted on the existing dew-shield. This ensures that any direct sunlight is totally blocked from entering the optics.”

Shahrin notes that 90% of the time, Venus with appear on the computer screen after aligning. Otherwise, a brief spiral search of the field will slide it into view.

Shahrin observes from his ShahGazer Observatory, a roll-off-roof observatory just outside of Kuala Lumpur. He used the Skywatcher 120ED refractor pictured for the captures, with a 2x Barlow lens to achieve a focal length of 1800mm. Shahrin’s main camera is a QHY CCD IMG132e, and the rig is mounted on a Skywatcher EQ6.

A closeup of Sharin’s barlow and camera rig. Credit: Shahrin Ahmad.

“The experience of being able to track Venus approaching inferior conjunction over the Sun afterwards is exhilarating,” Shahrin told Universe Today. “It felt like watching and waiting for a total eclipse of the Sun, but in slow motion!”

Shahrin also counts himself lucky to have had a string of clear days leading up to and after inferior conjunction.

Shahrin’s capture of Venus 5 degrees from the Sun just 8 hours before inferior conjunction may also be a record. That’s a closer apparent separation than our visual sighting of Venus 7 hours and 45 minutes after inferior conjunction on January 16th 1998 as seen from North Pole Alaska, when the planet passed 5.5 degrees from the limb of the Sun.

“I’ve also noticed that in some of the photos, we can see a slight ‘glint’ of sunshine on part of Venus’ atmosphere,” Shahrin noted to Universe Today. “(This sighting) was actually confirmed by the RASC Edmonton Centre in Canada via their Twitter feed.”

An amazing capture, indeed. Venus is now back in the realm of visibility for us mere mortal backyard observers low in the dawn sky, shining at a brilliant magnitude -4.3. Expect it to vault up in a hurry for northern hemisphere observers as the favorable angle of the ecliptic will give it a boost in the dawn. Venus is also headed towards a spectacular 0.2 degree conjunction with Jupiter this summer on August 18th: expect UFO sightings to rise correspondingly. The Indian Army even briefly mistook the pair for Chinese spy drones early last year.

The waning crescent Moon approaches Venus on the morning of January 28th, 2014. Created using Stellarium.

Venus will spend most of 2014 in the dawn sky and is headed for superior conjunction on October 25^th, 2014. Venus spent a similar span in the dawn for the majority 2006, and will do so again in 2022. It’s all part of the 8-year cycle of Venus, a span over which apparitions of the planet roughly repeat. And the next shot we’ll have at inferior conjunction? That’ll be on August 15^th, 2015 for favoring the southern hemisphere and March 25^th, 2017 once again favoring the northern, when the planet very nearly passes as far from the Sun as it can appear at inferior conjunction at 8 degrees.

Congrats to Shahrin on his amazing capture!

-Follow the stargazing adventures of Sharin Ahmad on Google+ and as @shahgazer on Twitter

-Got pictures of Venus? Send ‘em in to Universe Today.

January 21, 2014December 30, 2015 by Jason Major

Why Is the Solar System Flat?

It’s no mystery that the planets, moons, asteroids, etc. in the Solar System are arranged in a more-or-less flat, plate-like alignment in their orbits around the Sun.* But why is that? In a three-dimensional Universe, why should anything have a particular alignment at all? In yet another entertaining video from the folks at MinutePhysics, we see the reason behind this seemingly coincidental feature of our Solar System — and, for that matter, pretty much all planetary systems that have so far been discovered (not to mention planetary ring systems, accretion disks, many galaxies… well, you get the idea.) Check it out above.

Video by MinutePhysics. Created by Henry Reich
Continue reading “Why Is the Solar System Flat?”

January 21, 2014December 23, 2015 by Shannon Hall

Surprise! Fomalhaut’s Kid Sister Has a Debris Disk Too

The bright star Fomalhaut hosts a spectacular debris disk: a dusty circling plane of small objects where planets form. At a mere 25 light-years away, we’ve been able to pinpoint detailed features: from the warm disk close by to the further disk that is comparable to the Solar System’s Kuiper belt.

But Fomalhaut never ceases to surprise us. At first we discovered a planet, Fomalhaut b, which orbits in the clearing between the two disks. Then we discovered that Fomalhaut was not a single star or a double star, but a triplet. The breaking news today, however, is that we have discovered a mini debris disk around the third star.

Fomalhaut is massive, weighing in at 1.9 times the mass of the Sun. And at such a close distance it’s one of the brightest stars in the southern sky. But its two companions are much smaller. The second star, Fomalhaut B, is 0.7 times the mass of the Sun and the third star, Fomalhaut C, a small red dwarf, is 0.2 times the mass of the Sun.

Fomalhaut C orbits Fomalhaut A at a distance of 2.5 light-years, or roughly half the distance from the Sun to the closest neighboring star. It was only confirmed to be gravitationally bound to Fomalhaut A and Fomalhaut B in October of last year.

“The disk around Fomalhaut C was a complete surprise,” lead researcher Grant Kennedy of the University of Cambridge told Universe Today. “This is only the second system in which disks around two separate stars have been discovered.”

Relatively cool dust and ice particles are much brighter at long wavelengths, allowing telescopes like the Herschel Space Telescope, to pick up the excess infrared light. However, Herschel has a much poorer resolution than an optical telescope so the image of Fomalhaut C’s disk is not spatially resolved — meaning the brightness of the disk could be measured but not its structure.

Kennedy’s team’s best guess is that the disk is quite cold, around 24 degrees Kelvin and pretty small, orbiting to and extent of 10 times the distance from the Earth to the Sun. But it’s likely that it’s similar to Fomalhaut A’s disk in that it’s bright, elliptical, and slightly offset from its host star. All three characteristics suggest that gravitational perturbations may be destabilizing the cometary orbits within the disks.

“As a stellar system Fomalhaut’s gotten very interesting in the last year,” Kennedy said. With two wide companions “it’s not obvious how the configuration came about. Forming one wide companion is not so hard, but getting a second is very unlikely. So we need to come up with a new mechanism.”

Kennedy is currently working on figuring out what exactly this “new mechanism” is and he thinks the debris disk around Fomalhaut C will provide a few helpful hints. His best guess is still under construction but it’s likely that a small star is disturbing the system.

The next step will be to watch the stellar system over the next few years in order to measure their orbits exactly. With precise motions we just might be able to see what is interrupting the system.

“We think these observations will provide a good test of the theory,” Kennedy told Universe Today. They just might “solve the mystery of why the Fomalhaut system looks like it does.”

The paper has been published in the Monthly Notices of the Royal Astronomical Society and is available for download here.

January 20, 2014December 23, 2015 by Tammy Plotner

Milky Way Shakes, Rattles and Rolls…

Three stages of the evolution of the galaxy simulation used to model the Milky Way. (Credit: AIP)

For decades astronomers have puzzled over the many details concerning the formation of the Milky Way Galaxy. Now a group of scientists headed by Ivan Minchev from the Leibniz Institute for Astrophysics Potsdam (AIP) have managed to retrace our galaxy’s formative periods with more detail than ever before. This newly published information has been gathered through careful observation of stars located near the Sun and points to a rather “moving” history.

To achieve these latest results, astronomers observed stars perpendicular to the galactic disc and their vertical motion. Just to shake things up, these stars also had their ages considered. Because it is nearly impossible to directly determine a star’s true age, they rattled the cage of chemical composition. Stars which show an increase in the ratio of magnesium to iron ([Mg/Fe]) appear to have a greater age. These determinations of stars close to the Sun were made with highly accurate information gathered by the RAdial Velocity Experiment (RAVE). According to previous findings, “the older a star is, the faster it moves up and down through the disc”. This no longer seemed to be true. Apparently the rules were broken by stars with the highest magnesium-to-iron ratios. Despite what astronomers thought would happen, they observed these particular stars slowing their roll… their vertical speed decreasing dramatically.

So what’s going on here? To help figure out these curious findings, the researchers turned to computer modeling. By running a simulation of the Milky Way’s evolutionary patterns, they were able to discern the origin of these older, slower stars. According to the simulation, they came to the conclusion that small galactic collisions might be responsible for the results they had directly observed.

Smashing into, or combining with, a smaller galaxy isn’t new to the Milky Way. It is widely accepted that our galaxy has been the receptor of galactic collisions many times during its course of history. Despite what might appear to be a very violent event, these incidents aren’t very good at shaking up the massive regions near the galactic center. However, they stir things up in the spiral arms! Here star formation is triggered and these stars move away from the core towards our galaxy’s outer edge – and near our Sun.

In a process known as “radial migration”, older stars, ones with high values of magnesium-to-iron ratio, are pushed outward and display low up-and-down velocities. Is this why the elderly, near-by stars have diminished vertical velocities? Were they forced from the galactic center by virtue of a collision event? Astronomers speculate this to be the best answer. By comparison, the differences in speed between stars born near the Sun and those forced away shows just how massive and how many merging galaxies once shook up the Milky Way.

Says AIP scientist Ivan Minchev: “Our results will enable us to trace the history of our home galaxy more accurately than ever before. By looking at the chemical composition of stars around us, and how fast they move, we can deduce the properties of satellite galaxies interacting with the Milky Way throughout its lifetime. This can lead to an improved understanding of how the Milky Way may have evolved into the galaxy we see today.”

Original Story Source: Leibniz Institute for Astrophysics Potsdam News Release. For further reading: A new stellar chemo-kinematic relation reveals the merger history of the Milky Way.

January 20, 2014December 29, 2015 by Susie Murph

Carnival of Space #337

Carnival of Space. Image by Jason Major.

The tent is up! This week’s Carnival of Space is hosted by Pamela Hoffman at the Everyday Spacer blog.

Click here to read Carnival of Space #337.

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.

January 20, 2014December 23, 2015 by Nancy Atkinson

Rosetta Wakes Up, Phones Home, Starts Tweeting

The Rosetta team at ESA’s space operations center in Darmstadt reacts after receiving a signal from the spacecraft. Credit: ESA.

The silence from the live video feed from the ESA’s space operations center in Darmstadt, Germany was almost deafening. Scientists and engineers were waiting to receive a signal from the Rosetta spacecraft, which was supposed to come out of hibernation today to begin its mission to Comet 67P/Churyumov-Gerasimenko in earnest. Finally, after waiting nearly 45 minutes into the window of time when the spacecraft was supposed to send a signal, a little blip appeared on the screens of the spectrum analyzers and the room erupted in cheers.

Data monitors from Rosetta showing the signal received back on Earth from the spacecraft. Credit: ESA.

“After waiting over two and a half years, what is three-quarters of an hour!” said Fred Jansen, ESA’s Rosetta mission manager. “The spacecraft is there, it’s awake and the science team knows there are two busy years ahead of them. Now we have to work hard. Thanks to the team that achieved this.”

“I think I can speak on behalf of everyone here and everyone on Twitter: that was rather stressful!” said Matt Taylor, Rosetta project scientist. “The work begins now and I think we’ll have a fun-filled two years ahead, so let’s get on it!”

Soon after the signal arrived, the mission Twitter feed came alive, Tweeting “Hello World” in multiple languages.

Labas, pasauli!

— ESA Rosetta Mission (@ESA_Rosetta) January 20, 2014

My antennas started tingling a few hours ago with all the shouting and wonderful #wakeuprosetta messages. Thank you!

— ESA Rosetta Mission (@ESA_Rosetta) January 20, 2014

Later in the day, as the team checked out the spacecraft, everything appeared in order and working well as systems began to start operating:

#Rosettta Operations Manager Andrea Accomazzo has taken a look at the data… we look good!

— ESA Operations (@esaoperations) January 20, 2014

Rosetta was placed into hibernation in June 2011, with only the computer and several heaters remaining active as the spacecraft cruised out to nearly 800 million km from the warmth of the Sun, beyond the orbit of Jupiter.

Today, as Rosetta’s orbit came back to within 673 million km from the Sun, there was enough solar energy to power the spacecraft fully again and Rosetta’s pre-programmed internal ‘alarm clock’ woke up the spacecraft after a record 957 days of hibernation. After warming up its key navigation instruments, coming out of a stabilizing spin, and aiming its main radio antenna at Earth, Rosetta sent a signal to let mission operators know it had survived the most distant part of its journey.

The signal was received by NASA’s Goldstone ground station in California at 18:18 GMT during the first window of opportunity the spacecraft had to communicate with Earth.

The one-way light time on today, January 20, 2014 between Rosetta and Earth was about 44 minutes and 53 seconds over a distance of 807,224,610.74 km. Rosetta was about 9,188,540 km from the comet, closing up at about 800 m/second.

“This was one alarm clock not to hit snooze on, and after a tense day we are absolutely delighted to have our spacecraft awake and back online,” said Jansen.

Comets are considered the primitive building blocks of the Solar System and perhaps may have helped to ‘seed’ Earth with water, or even the ingredients for life. But many fundamental questions about these enigmatic objects remain, and through its comprehensive, in situ study of Comet 67P/Churyumov-Gerasimenko, Rosetta aims to unlock the secrets contained within.

“All other comet missions have been flybys, capturing fleeting moments in the life of these icy treasure chests,” said Taylor. “With Rosetta, we will track the evolution of a comet on a daily basis and for over a year, giving us a unique insight into a comet’s behavior and ultimately helping us to decipher their role in the formation of the Solar System.”

So schön! #WakeUpRosetta Flug frei für @Philae2014. Der Lander soll im November auf dem Kometen aufsetzen (AS) pic.twitter.com/ZlN9ZhIQJP

— DLR_de (@DLR_de) January 20, 2014

But first, essential health checks on the spacecraft must be completed. Then the eleven instruments on the orbiter and ten on the lander will be turned on and prepared for studying Comet 67P/Churyumov-Gerasimenko.

“We have a busy few months ahead preparing the spacecraft and its instruments for the operational challenges demanded by a lengthy, close-up study of a comet that, until we get there, we know very little about,” says Andrea Accomazzo, Rosetta operations manager.

Rosetta’s first images of 67P/Churyumov-Gerasimenko are expected in May, when the spacecraft is still 2 million km from its target. Towards the end of May, the spacecraft will execute a major maneuver to line up for its critical rendezvous with the comet in August.

After rendezvous, Rosetta will start with two months of extensive mapping of the comet’s surface, and will also make important measurements of the comet’s gravity, mass and shape, and assess its gaseous, dust-laden atmosphere, or coma. The orbiter will also probe the plasma environment and analyse how it interacts with the Sun’s outer atmosphere, the solar wind.

Using these data, scientists will choose a landing site for the mission’s 100 kg Philae probe. The landing is currently scheduled for November 11, 2014 and will be the first time that a landing on a comet has ever been attempted.

With almost negligible gravity from the comet’s 4 km-wide nucleus, Philae will have to use ice screws and harpoons to stop it from rebounding back into space after touchdown.

Among its wide range of scientific measurements, Philae will send back a panorama of its surroundings, as well as very high-resolution pictures of the surface. It will also perform an on-the-spot analysis of the composition of the ices and organic material, including drilling down to 23 cm below the surface and feeding samples to Philae’s on-board laboratory for analysis.

The focus of the mission will then move to the ‘escort’ phase, during which Rosetta will stay alongside the comet as it moves closer to the Sun, monitoring the ever-changing conditions on the surface as the comet warms up and its ices sublimate.

Rosetta will follow the comet throughout the remainder of 2015, as it heads away from the Sun and activity begins to subside.

You can read the team’s blog about the “wake up” here, and find out more about the Rosetta mission here.

Here’s a replay of the acquisition of signal:

January 20, 2014December 28, 2015 by Fraser Cain

Astronomy Cast Ep. 331: Arthur C. Clarke’s Technologies

In our previous episode, we introduced Arthur C. Clarke, the amazing man and science fiction writer. Today we’ll be discussing his legacy and ideas on space exploration. You’ll be amazed to hear how many of the ideas we take for granted were invented or just accurately predicted by Arthur C. Clarke.
Continue reading “Astronomy Cast Ep. 331: Arthur C. Clarke’s Technologies”