Researchers say that early Mars likely had a thick hydrogen atmosphere that allowed water to exist for millions of years, even before Earth had oceans.
A new study uses solar occultation data from NASA's Cassini mission to better understand the composition, formation and other secrets of Saturn's rings.
Astronomers discovered and measured a super-fast jet, thought to be the result of 2 neutron stars colliding. The jet is moving at 99.97% the speed of light!
The NEOWISE space telescope has been taking all-sky images for 12 years, creating a movie of the sky that astronomers can use to watch the changing cosmos.