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NASA Image of the Day Wed, 10 Mar 2010 16:00:18 GMT  

Snapshot of the International Space Station
On March 13, 2008, the International Space Station passed across the field-of-view of Germany's remote sensing satellite, TerraSAR-X, at a distance of 195 kilometers, or 122 miles, and at a relative speed of 34,540 kilometers per hour, or more than 22,000 mph. In contrast to optical cameras, radar does not 'see' surfaces. Instead, it is much more aware of the edges and corners which bounce back the microwave signal it transmits. Smooth surfaces such as those on the station's solar generators or the radiator panels used to dissipate excess heat, unless directly facing the radar antenna, tend to deflect rather than reflect the radar beam, causing these features to appear on the radar image as dark areas. The radar image of the station therefore looks like a dense collection of bright spots from which the outlines of the space station can be clearly identified. The central element on the station, to which all the modules are docked, has a grid structure that presents a multiplicity of reflecting surfaces to the radar beam, making it readily identifiable. This image has a resolution of about one meter (about 39 inches). In other words, objects can be depicted as discrete units--that is, shown separately--provided that they are at least one meter apart. If they are closer together than that, they tend to merge into a single block on a radar image. Since this image as taken, the station has expanded and is more than 90 percent complete, including a full complement of solar arrays. Image Credit: DLR

Space Spin Wed, 10 Mar 2010 16:00:18 GMT  

Biggest, deepest crater exposes hidden, ancient Moon
Shortly after the Moon formed, an asteroid smacked into its southern hemisphere and gouged out a truly enormous crater, the South Pole-Aitken basin, almost 1,500 miles across and more than five miles deep.

"This is the biggest, deepest crater on the Moon -- an abyss that could engulf the United States from the East Coast through Texas," said Noah Petro of NASA's Goddard Space Flight Center in Greenbelt, Md. The impact punched into the layers of the lunar crust, scattering that material across the Moon and into space. The tremendous heat of the impact also melted part of the floor of the crater, turning it into a sea of molten rock.

Is that Saturn's moon Titan or Utah?
Planetary scientists have been puzzling for years over the honeycomb patterns and flat valleys with squiggly edges evident in radar images of Saturn's moon Titan.

Now, working with a "volunteer researcher" who has put his own spin on data from NASA's Cassini spacecraft, they have found some recognizable analogies to a type of spectacular terrain on Earth known as karst topography.

Lava likely made river-like channel on Mars
Flowing lava can carve or build paths very much like the riverbeds and canyons etched by water, and this probably explains at least one of the meandering channels on the surface of Mars.

These results were presented at the 41st Lunar and Planetary Science Conference by Jacob Bleacher at NASA's Goddard Space Flight Center, Greenbelt, Md. Whether channels on Mars were formed by water or by lava has been debated for years, and the outcome is thought to influence the likelihood of finding life there.


Space Wire Top Stories Wed, 10 Mar 2010 16:00:18 GMT  

NASA Launches Interactive Simulation of Satellite Communications
Student Teams Ready to Battle Lunar Terrain at NASA's 17th Annual Great Moonbuggy Race
Revisiting chicxulub: A broad look at the evidence for a dinosaur-killing impact

Cassini-Huygens Latest Wed, 10 Mar 2010 16:28:24 GMT  

Titan's Changing Seasons
Titan's Changing SeasonsThe Cassini spacecraft records Titan's seasonal hemispheric dichotomy, with the moon's northern half appearing slightly lighter than the southern half in this image. This view looks toward the trailing hemisphere of Titan. North on Titan is up and rotated 12 degrees to the right.
Titan's Changing Seasons
Titan's Changing SeasonsCassini records Titan's seasonal hemispheric dichotomy, with the moon's northern half appearing slightly lighter than the southern half.
Is That Saturn's Moon Titan or Utah?
Sikun Labyrinthus, an Artistic ViewScientists studying Titan have found analogies to a type of spectacular terrain on Earth known as karst topography.

SPACE.com Wed, 10 Mar 2010 16:00:19 GMT  

Smithsonian Rolls Out Red Carpet for Hubble 3D Premiere
The Smithsonian National Air and Space Museum in Washington, D.C. Tuesday for the world premiere of the Hubble 3D IMAX film.
Air Force to Test New Hypersonic Aircraft
The U.S. Air Force is gearing up for the first of four planned test flights of a hypersonic aircraft designed to operate for much longer durations and cover far greater distances than previous platforms of its type.
Warp Speed Will Kill You
Harmless interstellar hydrogen becomes deadly ionized radiation that would fry the crew and electronics of starships traveling near light speed, according to a physicist.

Science @ NASA Wed, 10 Mar 2010 16:00:19 GMT  

Spirit's Journey to the Center of Mars
NASA's venerable Mars rover Spirit is starting a second career as an explorer of the Martian core--but first it must survive the deadly Martian winter.
Cool Movie: SDO Destroys a Sundog
NASA's Solar Dynamics Observatory amazed onlookers last week when it flew past a sundog and destroyed it. Must-see videos of the event captured shock waves from the rocket billowing through the sundog, eliciting cries of delight and amazement from the crowd below.
3D Sun for the iPhone
Imagine holding the entire sun in the palm of your hand. Now you can. A new iPhone app developed by NASA-supported programmers delivers a live global view of the sun directly to your cell phone.

EurekAlert! - Space and Planetary Science Wed, 10 Mar 2010 16:28:24 GMT  

Tropical cyclone formation likely near Madagascar
(NASA/Goddard Space Flight Center) Forecasters are watching a low pressure area located off the east coast of Madagascar that appears ripe for development in the Southern Indian Ocean. If it becomes a tropical storm, it would be named Hubert.
Scientists discover 'catastrophic event' behind the halt of star birth in early galaxy formation
(Durham University) Scientists have found evidence of a catastrophic event they believe was responsible for halting the birth of stars in a galaxy in the early Universe.
Most extreme white dwarf binary system found with orbit of just 5 minutes
(University of Warwick) An international team of astronomers, including Professor Tom Marsh and Dr. Danny Steeghs from the University of Warwick, have shown that the two stars in the binary HM Cancri definitely revolve around each other in a mere 5.4 minutes. This makes HM Cancri the binary star with by far the shortest known orbital period. It is also the smallest known binary.

What's New at the Lunar & Planetary Institute Library Wed, 10 Mar 2010 16:00:19 GMT  

New & Noteworthy - News from the LPI
New & Noteworthy - Peer Review
New & Noteworthy - LPI RSS Feed

ESA Science & Technology Wed, 10 Mar 2010 16:00:20 GMT  

Herschel:Herschel-HIFI unveils precursors of life-enabling molecules in Orion Nebula
ESA's Herschel Space Observatory has revealed the chemical fingerprints of potential life-enabling organic molecules in the Orion Nebula, a nearby stellar nursery in our Milky Way galaxy. This detailed spectrum, obtained with the Heterodyne Instrument for the Far Infrared (HIFI) - one of Herschel's three innovative instruments - demonstrates the gold mine of information that Herschel-HIFI will provide on how organic molecules form in space.
Hubble:Bully galaxy rules the neighbourhood [heic1004]
In general, galaxies can be thought of as "social" - hanging out in groups and frequently interacting. However, this recent NASA/ESA Hubble Space Telescope image highlights how some galaxies appear to be hungry loners. These cosmic oddities have set astronomers on the "case of the missing neighbour galaxies".
Mars Express:Mars Express to make closest ever approach to Phobos
On 3 March 2010 Mars Express will make its closest ever approach to Phobos, the larger of the two Martian moons. During a series of flybys, spanning six weeks, all seven instruments onboard Mars Express will be utilised to study Phobos. The close approach provides a first opportunity to perform a unique gravity experiment that may reveal the distribution of mass within this intriguing moon.

ScienceDaily: Space & Time News Wed, 10 Mar 2010 16:00:20 GMT  

Scientists discover 'catastrophic event' behind the halt of star birth in early galaxy formation
Scientists have found evidence of a catastrophic event they believe was responsible for halting the birth of stars in a galaxy in the early universe. The researchers observed the massive galaxy as it would have appeared just three billion years after the Big Bang when the Universe was a quarter of its present age.
Most extreme white dwarf binary system found with orbit of just five minutes
An international team of astronomers has shown that the two stars in the binary HM Cancri definitely revolve around each other in a mere 5.4 minutes. This makes HM Cancri the binary star with by far the shortest known orbital period. It is also the smallest known binary.
Biggest, deepest crater exposes hidden, ancient moon
Shortly after the Moon formed, an asteroid smacked into its southern hemisphere and gouged out a truly enormous crater, the South Pole-Aitken basin, almost 1,500 miles across and more than five miles deep.

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