Possible Signs of Ancient Drying in Martian Rock

A grid of small polygons on the Martian rock surface near the right edge of this view may have originated as cracks in drying mud more than 3 billion years ago.

NASA Astronaut Shane Kimbrough on Jan. 13 Spacewalk

Expedition 50 Commander Shane Kimbrough of NASA at work outside the International Space Station on Jan. 13, 2017, in a photo taken by fellow spacewalker Thomas Pesquet of ESA. The two astronauts successfully installed three new adapter plates and hooked up electrical connections for three of the six new lithium-ion batteries on the station.

Ginger Bread

Crescent Jupiter with the Great Red Spot

This image of a crescent Jupiter and the iconic Great Red Spot was created by a citizen scientist (Roman Tkachenko) using data from Juno's JunoCam instrument.

Well-Preserved Impact Ejecta on Mars

This image of a well-preserved unnamed elliptical crater in Terra Sabaea, is illustrative of the complexity of ejecta deposits forming as a by-product of the impact process that shapes much of the surface of Mars.

The Red Ice Forest

NASA Astronaut Peggy Whitson's 7th Spacewalk

NASA Astronaut Peggy Whitson's 7th Spacewalk