No one has come out with a hypothesis that can explain the dark streaks without water, says the lead author of a new paper assessing images and observations from Mars. But no direct evidence of water has been found.
NASA's Curiosity rover is eyeing a three-foot-tall sand dune, an ambitious climb for the SUV-sized rover. Despite the size of the climb, NASA doesn't expect the rover to actually catch air on this maneuver.
NEOWISE, an infrared telescope orbiting Earth, returns test images in preparation for hunting and characterizing near-Earth objects, especially asteroids. The information it provides will help scientists gauge the hazard different asteroids pose.
China has sent its Jade Rabbit rover to a lunar crater with rocks far younger than any explored by the US or Russia. Its findings could help piece together a little-understood period in the moon's history.