Amateur astronomer Alex Cherney captured these star trails as they blazed above Lake Tyrrell, a salt lake in Victoria, Australia, in October 2011 and posted to The World At Night website December 25, 2012.
The sprawling Japanese capital Tokyo looks like a funky computer chip in this image taken by Germany's Earth-observing satellite TerraSAR-X and released December 20.
Launched in 2007, the satellite's radar sensors map Earth from 319 miles (514 kilometers) up in a near-polar orbit.
Image courtesy DLR
NASA's Solar Dynamics Observatory snapped this extreme ultraviolet view of an active region on the sun as it rotated into view from December 16 to December 18. Ultraviolet light makes it easier to trace the whorls and loops created by superheated gas, or plasma, and the sun's magnetic field lines.
This image of the unlit side of Saturn's S rings, released December 24, was taken with visible light by NASA's Cassini spacecraft.
The shadow of Saturn's innermost major moon, Mimas, is visible as a black oval south of the rings' shadow. For those with completely dust-free computer monitors, Janus, another Saturnian moon, is visible as a tiny white speck above the planet's north pole. (Learn about Saturn's major moons.)
Image courtesy SSI/Caltech/NASA
A River Runs Through It
The European Space Agency released this picture—taken by Japan's satellite ALOS—of Italy's longest river on December 14.
The Moshniy glacier, located on the Russian archipelago Novaya Zemlya in the Arctic Ocean, calves chunks of ice and debris into a pattern reminiscent of broccoli in an image released December 20.
Novaya Zemlya was a sensitive military area during the Cold War, and was also the site of the most powerful nuclear device ever detonated. The energy released by the 50-megaton "Tsar" bomb was ten times that of all the explosions set off during World War II.