NASA says "cross-bedding" in the layers of this Martian rock is proof that water moved on Mars, leaving waves or ripples of loose sediment. The image is from a site at Mount Sharp that NASA calls "Whale Rock."
The Orion capsule is poised to make its first test flight Thursday. If all goes as planned, the unmanned vehicle will orbit Earth twice before splashing into the Pacific Ocean.
This photo released by Vandenberg Air Force Base on Monday shows the X-37B Orbital Test Vehicle, the Air Force's unmanned, reusable space plane, after it landed at Vandenberg from a previous orbital mission.
A member of the Indian security force keeps watch over a launch vehicle carrying the Mars Orbiter probe at the Indian Space Research Organization facility, in Sriharikota, in 2013.