Solar Dragon
Image courtesy SDO/NASA
Resembling a dragon's tail, remnants of a solar filament strain to escape the sun's gravity in an image released this week by NASA's Solar Dynamics Observatory.
Most of the electrically charged gas, imaged in extreme ultraviolet light, was unsuccessful in its escape attempt and fell back into the sun.
Filaments form when magnetic field lines push out of the sun in loops, holding dense gas above the surface of the sun. (Read about a huge solar filament that erupted in August 2012.)
—Jane J. Lee and Christine Dell'Amore
Published February 8, 2013
Aurora On The Road
Photograph by Marcel Mivelaz, My Shot
Northern lights writhe behind a thin cloud layer above a road on Ringvassoya Island, Norway, in this picture submitted to National Geographic's My Shot photography community on January 31.
Born of violent eruptions of plasma from the sun's surface, auroras occur when the ejected gas slams into the protective bubble of Earth's magnetic field. (Watch a video about the birth of auroras.)
Published February 8, 2013
Celestial Seagull
Image courtesy ESO
Like a parrot perched on a pirate's arm, the Seagull Nebula resides in one of the spiral arms of the Milky Way.
This new image, released by the European Southern Observatory on February 6, shows a closeup of one of the "wings" of the Seagull Nebula. Red clouds of hydrogen gas glow from the intense ultraviolet radiation given off with the birth of stars.
The entire nebula is actually comprised of three large gas clouds arranged in the shape of a bird. (See pictures of other nebulae.)
Published February 8, 2013
Saturn's North Pole
Image courtesy Caltech/SSI/NASA
Saturn's hexagon-shaped north pole is lit by the sun now that spring has come to the planet's northern hemisphere, as seen in a NASA picture released this week.
The 15,000-mile-wide (25,000-kilometer-wide) cloud formation, captured by the Cassini spacecraft's wide-angle camera in November, was initially spied during the Voyager missions in the 1980s. (See another Cassini picture of the hexagon.)
Published February 8, 2013
Martian Avalanches
Image courtesy U. Arizona/NASA
A 2011 frost avalanche kicks up dust on Mars in a picture released this week by Mars Reconnaissance Orbiter's HiRISE camera team.
Frost avalanches usually occur at the onset of the Martian spring, when layers of carbon dioxide frost warm, causing ice and dust to cascade off of cliffs.
"While HiRISE has captured other frost avalanches before, they never cease to amaze, since it demonstrates that there are indeed active processes on the red planet," according to the HiRISE website. (Related: "First Mars Avalanches Seen In Action.")
Published February 8, 2013
Luminous London
Photograph courtesy NASA
London gleams in a nighttime picture taken from the International Space Station on February 2.
Expedition 34 Flight Engineer Chris Hadfield captured the English city while flying about 240 miles (400 kilometers) above Earth.
Published February 8, 2013
Illustration courtesy Foster and Partners/ESA
Published February 8, 2013
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