NASA astronaut Suni Williams works outside the International Space Station. Credit: NASA | edited by Space.com's Steve Spaleta ...

Valles Marineris in imagery captured the Mars Reconnaissance Orbiter. Global topography: NASA/GSFC CTX global mosaic: ...

A new map shows hidden Martian rivers stretching thousands of miles, offering fresh evidence of a warm, wet ancient Mars.

So does Cedar Barg, a climate network manager for the Wild Center, which is in upstate New York and has been running youth climate summits around the world since 2009. Barg worked with Johnson, Lyra ...