Posted on by Jason Major

NASA Scientists Soar Over a Mini Ice Cap

Saunders Island and Wolstenholme Fjord with Kap Atholl in the background photographed during a NASA IceBridge flight. (NASA/Michael Studinger)

It’s quite a long way from Mars, but I can’t help but be reminded of the Red Planet’s ice-covered north pole when looking at this photo taken by Michael Studinger earlier this month, during a recent IceBridge survey flight over Greenland.

Called Saunders Island (also Appat Island) the 82-square-mile frozen slab of rock rises from the sea off the coast of northwestern Greenland, one of many islands within the Wolstenholme (Uummannaq) Fjord on the shore of Baffin Bay. Operation IceBridge, a six-year aerial survey of the changing ice coverage at our planet’s poles, is run by NASA to provide valuable ground-level information to supplement satellite data.

To me, the shape of the island’s steep rock faces and rugged inlets slice into its interior bear a striking resemblance to Mars’ ice cap.

Mars' north polar ice cap
Mars’ north polar ice cap

While Mars’ ice cap is shaped by very different processes — and obviously much bigger — you might see the connection too!

But rather than dark Martian dunes, sea ice can be seen surrounding the islands in varying thicknesses in the IceBridge photo above. Sea ice coverage in the fjord ranges from thicker, white ice in the background to thinner “grease” ice and leads with dark, open ocean water in the foreground.

The IceBridge P-3B airborne laboratory in a hangar at Wallops Flight Facility (NASA/George Hale)
The IceBridge P-3B airborne laboratory in a hangar at Wallops Flight Facility (NASA/George Hale)

As the amount of darker, ice-free water surfaces increase over the course of the year due to rising global temperatures, the more heat from solar radiation is collected in the ocean — thus speeding up the process of seasonal sea ice loss and overall Arctic warming.

Read more about the IceBridge mission here, and see a collection of more photos from this season’s flights here.

NASA’s Operation IceBridge images Earth’s polar ice in unprecedented detail to better understand processes that connect the polar regions with the global climate system. IceBridge utilizes a highly specialized fleet of research aircraft and the most sophisticated suite of innovative science instruments ever assembled to characterize annual changes in thickness of sea ice, glaciers, and ice sheets. In addition, IceBridge collects critical data used to predict the response of earth’s polar ice to climate change and resulting sea-level rise.

 

Posted on by John Williams

Fly Along With Voyager

Fly along with NASA's Voyager spacecraft as the twin probes head towards interstellar space. In this artist's concept, a regularly updated gauge using data from the two spacecraft will indicate the levels of particles that originate from far outside our solar system and those that originate from inside our solar bubble. Those are two of the three signs scientists expect to see in interstellar space. The other sign is a change in the direction of the magnetic field. Image credit: NASA/JPL-Caltech

Far away, deep in the dark, near the edge of interstellar space, Voyager 1 and 2 are hurtling near the tenuous edge of the magnetic bubble surrounding the Sun known as the heliosphere and NASA wants you to ride along.

The Voyager website sports a new feature showing cosmic ray data. NASA’s Eyes on the Solar System, a popular Web-based interactive tool, contains a new Voyager module, that not only lets you ride along for the Voyagers’ journeys but also shows important scientific data flowing from the spacecraft.

[Warning:Play with this tool at your own risk. Interacting with this online feature can seriously impact your time; in an educational way, of course!]

As Voyager 1 explores the outer limits of the heliosphere, where the breath from our Sun is just a whisper, scientists are looking for three key signs that the spacecraft has left our solar system and entered interstellar space, or the space between stars. Voyager 1 began heading for the outer Solar System after zipping through the Saturn system in 1980.

The new module contains three gauges, updated every six hours from real data from Voyager 1 and 2, that indicate the level of fast-moving particles, slower-moving particles and the direction of the magnetic field. Fast-moving charged particles, mainly protons, come from distant stars and originate from outside the heliosphere. Slower-moving particles, also mainly protons, come from within the heliosphere. Scientists are looking for the levels of outside particles to jump dramatically while inside particles dip. If these levels hold steady, it means the Voyager spacecraft no longer feel the wind from our Sun and the gulf between stars awaits.

Over the past couple of years, data from Voyager 1, the most distant man-made object, show a steady increase of high-powered cosmic radiation indicating the edge is near, scientists say. Voyager 1 appears to have reached the last region before interstellar space. Scientists dubbed the region the “magnetic highway.” Particles from outside are streaming in while particles from inside are streaming out. Voyager 2’s instruments detect slight drops in inside particles but scientists don’t think the probe has entered the area yet.

Scientists also expect a change in the direction of the magnetic field. While particle data is updated every six hours, analyses of the magnetic field data usually takes a few months to prepare.

A snapshot riding along with Voyager 1's looking back at the Sun and inner solar system. The positions of Voyager 2 and Pioneers 10 and 11 show within the viewport as well.
A snapshot riding along with Voyager 1’s looking back at the Sun and inner solar system. The positions of Voyager 2 and Pioneers 10 and 11 show within the viewport as well.

Although launched first, Voyager 2 lags behind its twin Voyager 1 by more than 20 times the distance between the Earth and the Sun. Voyager 2 blasted off August 20, 1977 aboard a Titan-Centaur rocket from Cape Canaveral, Florida. The nuclear-powered craft visited Jupiter and Saturn with an additional mission, called the Grand Tour, to study Uranus and Neptune. Voyager 1 launched two weeks later on September 5, 1977. With a faster flight path, Voyager 1 arrived at Jupiter four months before its sister craft. Voyager 1 went on to study Saturn before using the ringed planet’s gravity field to slingshot it up and out of the plane of the solar system toward the constellation Ophiuchus, the Serpent Bearer.

NASA’s Eyes on the Solar System allows viewers to hitch a ride with any of NASA’s spacecraft as they explore the solar system. Time can be slowed for a near approach of a moon or asteroid or sped up to coast between the planets. Watch close at just the right moment and you can witness one of the spacecrafts roll maneuvers. All spacecraft movements are based on actual spacecraft navigation data.

Check out the Voyager module here, and check out the rest of the the Solar System here at Eyes on the Solar System.

Posted on by Bob King

Catch Comet Lemmon While You Can

On May 6 a beautiful thin moon will be near Comet Lemmon at dawn. This map shows the sky about 1 1/4 hours before sunrise. Stellarium

If you honed your observing chops on Comet PANSTARRS this spring, consider dropping in on Comet Lemmon, now returning to the dawn sky. Southern hemisphere observers saw this comet at its brightest in March when it briefly became dimly visible with the naked eye. It’s now faded to around magnitude 6, the same as the faintest stars you can see under a rural sky.

Because it’s been “vacationing” in the southern constellations, northerners have had to wait until now to see it.

Comet Lemmon with gas (left) and dust tails on April 24. Click to see a short movie showing rapid changes in the comet's tail in 25 minutes. Credit: Gerald Rhemann
Comet Lemmon with gas (left) and dust tails on April 24. Click to see a short movie showing rapid changes in the comet’s tail in 25 minutes. Credit: Gerald Rhemann

Like PANSTARRS, C/2012 F6 Lemmon is visible in modest-sized binoculars (7x35s, 10x50s) as a small, fuzzy ball of light with perhaps a faint tail. Watch for it to slowly track along the eastern side of the Great Square of Pegasus for the remainder of April and May. It competes with twilight low in the eastern sky this week but gradually becomes better placed for viewing as May unfolds. The best time to look is about an hour and a half before sunrise now and 2 hours before sunrise by mid-May.

The waning moon interferes some until around May 5. On the 6th, watch for the thin lunar crescent moon to pass 8 degrees below the comet. Around that time, we’ll finally get a good view of Lemmon in a dark, moonles sky just before the start of dawn.

On May 6 a beautiful thin moon will be near Comet Lemmon at dawn. This map shows the sky about 1 1/4 hours before sunrise. Stellarium
On May 6 a beautiful thin moon will be near Comet Lemmon at dawn. This map shows the sky about 1 1/4 hours before sunrise. Stellarium

Comet Lemmon will fade from naked eye limit to a dim binocular smudge of 7.5 magnitude  by mid-May. If you have a telescope, look for a pair of tails – a short, diffuse one of dust particles and the straight, streak-like gas tail fluorescing in the sun’s ultraviolet light. The tails point approximately to the south-southwest. Catch this comet while you can!

Posted on by Nancy Atkinson

Saturn Reaches Opposition on April 28

Saturn is one of the most striking objects to see through a telescope, and it is now at its brightest in the night sky as it reaches opposition from the Sun. This is when Earth stands mostly perfectly in line between Saturn and the Sun. It is when Saturn is brightest (at magnitude +0.3), closely approximating famous “first magnitude” stars like Betelgeuse. Also, it is when Saturn is out all night long. Continue reading “Saturn Reaches Opposition on April 28”

Posted on by Elizabeth Howell

Experts Urge Removal of Space Debris From Orbit

Space debris has been identified as a growing risk for satellites and other space infrastructure. Credit: NASA

Action is needed soon to remove the largest pieces of space debris from orbit before the amount of junk destroys massive amounts of critical space infrastructure, according to a panel at the Sixth European Conference on Space Debris.

“Whatever we are going to do, whatever we have to do, is an expensive solution,” said Heiner Klinkrad, head of the European Space Agency space debris office, in a panel this week that was broadcast on ESA’s website.

“We have to compare the costs to solving the problem in an early stage as opposed to losing the infrastructure in orbit in the not-too-distant future.”

The panel estimated that there is $1.3 billion (1 billion Euros) worth of space satellite infrastructure that must be protected. The 200 most crucial satellites identified by the space community have an insured value of $169.5 million (130 million Euros), Klinkrad added.

Critical infrastructure, though not specified exactly by the panel, can include communication satellites and military eyes in the sky. Also at risk is that largest of human outposts in space — the International Space Station.

A view of the International Space Station as seen by the last departing space shuttle crew, STS-135. Credit: NASA
A view of the International Space Station as seen by the last departing space shuttle crew, STS-135. Credit: NASA

The conference concluded that without further action — even without launching any new rockets — it’s quite possible there could be a runaway effect of collisions producing debris within a few decades. Even a tiny object could act like a hand grenade in orbit if it smashes into a satellite, Klinkrad said.

A recent example of the problem: a piece of Chinese space debris smashed into a Russian satellite in March. It didn’t destroy the satellite, but altered its orbit.

To mitigate the situation, representatives suggested removing 5 to 10 large pieces of debris every year. They added they are uncertain about how soon a large problem would occur, but noted that the number of small objects is definitively increasing annually according to measurements done by the Walter Baade 6.5-meter Magellan Telescope.

“[It’s] something we haven’t know until now. We have been suspecting it is the case … this is a new result which is very important.”

While highlighting the risk, the European representatives of the panel added they are not standing idly by. Already, there are regulatory changes that could slow the problem for future launches — although there still will be cleanup to do from five past decades of space exploration.

Artist's conception of DEOS (German orbital servicing mission). Credit: Astrium
Artist’s conception of DEOS (German orbital servicing mission). Credit: Astrium

A few of the points brought up:

– German officials are working on an in-orbit satellite servicing solution called DEOS. “The DEOS project will for the first time demonstrate technologies for the controlled in-orbit disposal of a defective satellite,” Astrium, the prime contractor for the definition phase, wrote in a press release in 2012. “In addition, DEOS will practice how to complete maintenance tasks – refuelling in particular – that extend the service life of satellites.”

– France’s Parliament passed the Space Operations Act in December 2010. “Its chief objective is to ensure that the technical risks associated with space activities are properly mitigated, without compromising private contractors’ competitiveness,” French space agency CNES wrote on its website. “The government provides a financial guarantee to compensate damages to people, property or the environment.”

– A United Nations subcommittee of the Committee on the Peaceful Uses of Outer Space is working on space sustainability guidelines that will include space debris and space operations practices. More details should be released in June, although Claudio Portelli (a representative from Italy’s space agency) warned he did not expect any debris removal proposals to emerge from this work.

For more technical details on the space debris problem, check out the webcast of the ESA space debris conference.

Posted on by Elizabeth Howell

Stonehenge Was An Ancient Burial Ground For the Rich: Study

Stonehenge. Credit: Wikimedia Commons

The site of Stonehenge — that mysterious collection of British rocks that could have served as a calendar using the stars — was also a graveyard for the elite, according to new research.

A British group led by the University College London looked at 63 bodies surrounding the historical site. They determined these people were part of a group of elite families that brought their relatives to Stonehenge for burial over more than 200 years, starting from 2,900 BC.

The bodies were buried long before the rocks visible today were erected, though.

“The first Stonehenge began its life as a huge graveyard,” stated UCL’s Parker Pearson, who led the study. “The original monument was a large circular enclosure built 500 years before the Stonehenge we know today, with the remains of many of the cremated bodies originally marked by the bluestones of Stonehenge. We have also discovered that the second Stonehenge was built 200 years earlier than thought, around 2500 BC.”

The findings were broadcast on Britain’s Channel 4 in March.

A separate study, that will be broadcast on BBC 4 Monday (April 29), shows that humans were in the area of Stonehenge about 3,000 years before it was constructed — making human occupancy about 5,000 years than previously thought.

According to media reports, a team from the United Kingdom’s Open University spotted evidence of human activity about a mile from Stonehenge, in nearby Amesbury.

Archaeologists found an extinct species of cow, called a wild auroch, on the site as well, supposing that it was some sort of migration route that attracted human hunters.

Source: University College London

Posted on by Fraser Cain

Weekly Space Hangout – April 26, 2013

We had an action packed Weekly Space Hangout on Friday, with a vast collection of different stories in astronomy and spaceflight. This week’s panel included Alan Boyle, Dr. Nicole Gugliucci, Scott Lewis, Jason Major, and Dr. Matthew Francis. Hosted by Fraser Cain.

Some of the stories we covered included: Pulsar Provides Confirmation of General Relativity, Meteorites Crashing into Saturn’s Rings, Radio Observations of Betelgeuse, Progress Docks with the ISS, Hubble Observes Comet ISON, Grasshopper Jumps 250 Meters, April 25th Lunar Eclipse, and the Mars One Reality Show.

We record the Weekly Space Hangout every Friday at 12 pm Pacific / 3 pm Eastern. You can watch us live on Google+, Cosmoquest or listen after as part of the Astronomy Cast podcast feed (audio only).

Posted on by Fraser Cain

The Virtual Star Party in 60 Seconds

Every Sunday night we connect up a bunch of telescopes into a live Google+ Hangout and showcase the night sky. In addition to a team of astronomers and their scopes, we usually have a few PhD astronomers on hand to explain the objects that we’re looking at. Each episode typically lasts about an hour and we’re able to see a few dozen objects. If you want to get the gist of what a Virtual Star Party looks like, check out this 60-second version put together by my co-host, Scott Lewis.

I’m not sure if Scott will have the energy to do these every week, but I love how this worked out.

We run the Virtual Star Party every Sunday night as a live Google+ Hangout. Want to find when it’s happening next? Just circle the Virtual Star Party page on Google+. Visit the Universe Today YouTube channel to see an archive of all our past events.

Posted on by Jason Major

The White House Releases a Report on Space Weather

A long, magnetic filament burst out from the Sun after a C-cladd flare on(Aug. 31, 2012 (NASA/SDO/AIA)

We live on a planet dominated by weather. But not just the kind that comes in the form of wind, rain, and snow — we are also under the influence of space weather, generated by the incredible power of our home star a “mere” 93 million miles away. As we orbit the Sun our planet is, in effect, inside its outer atmosphere, and as such is subject to the constantly-flowing wind of charged particles and occasional outbursts of radiation and material that it releases. Although it may sound like something from science fiction, space weather is very real… and the more we rely on sensitive electronics and satellites in orbit, the more we’ll need to have accurate weather reports.

Fortunately, the reality of space weather has not gone unnoticed by the U.S. Federal Government.

An X1.6 flare eruption on Jan. 27, 2012 (NASA/SDO/AIA)
An X1.6 flare eruption on Jan. 27, 2012 (NASA/SDO/AIA)

Today the White House Office of Science and Technology Policy released a new report, Space Weather Observing Systems: Current Capabilities and Requirements for the Next Decade, which is an assessment of the United States government’s capacity to monitor and forecast potentially harmful space weather and how to possibly mitigate the damage from any exceptionally powerful solar storms in the future.

The report was made by a Joint Action Group (JAG) formed by the National Space Weather Program Council (NSWPC).

The impacts of space weather can have serious economic consequences. For example, geomagnetic storms during the 1990’s knocked out several telecommunications satellites, which had to be replaced at a cost of about $200 million each. If another “once in a century” severe geomagnetic storm occurs (such as the 1859 “super storm”), the cost on the satellite industry alone could be approximately $50 – $100 billion. The potential consequences on the Nation’s power grid are even higher, with potential costs of $1 – 2 trillion that could take up to a decade to completely repair.

– Report on Space Weather Observing Systems: Current Capabilities and Requirements for the Next Decade (April 2013)

“In other words,” according to the report, “the Nation is at risk of losing critical capabilities that have significant economic and security impacts should these key space weather observing systems fail to be maintained and replaced.”

Obviously, not good.

Read the full report here, and follow current and ongoing space weather events on the NOAA’s Space Weather Prediction Center website.

Source: White House Office of Science and Technology Policy

The National Space Weather Program is a Federal interagency initiative with the mission of advancing the improvement of space weather services and supporting research in order to prepare the country for the technological, economic, security, and health impacts that may arise from extreme space weather events.