NASA really isn't sure why ancient Mars was wet
Curiosity rover data leaves scientists uncertain of how Martian lakes could have existed.
Gamma ray telescope spots ancient, intense black holes
It also helped detect 'hidden' rays from the Sun.
Europe's space agency plans to launch a space-weather satellite
It could provide a unique view of the sun and lead to more accurate coronal mass ejection predictions.
ICYMI: Sorting crops with artificial intelligence
Classifying the quality of cucumbers so farmers don’t have to.
Solar dish sets steamy thermal energy efficiency record
It's thought to be the world's most efficient solar receiver.
NASA regains contact with spacecraft after a 2-year silence
It's finally talking to its STEREO-B probe after an ill-fated test in 2014.
NASA films Mercury crossing the sun's surface
It only happens roughly 13 times every century.
Watch Mercury cross the Sun starting at 7AM Eastern
You can view this rare celestial event online.
One-year timelapse video of the sun shows its dancing corona
NASA's Solar Dynamics Observatory has been observing the sun for six years now.