The Mystery of Saturn’s Double Aurorae
New infrared observations reveal a second auroral ring on Saturn that may help astronomers understand what causes the planet's aurorae in the first place.
Hubble Looks into the Coma Cluster
The HST captures a pristine image of various galaxy types grouped together, but what is most intriguing is what the image doesn't reveal.
Moonlets Perturb Saturn’s Ring
New observations from Cassini show small satellites are responsible for Saturn's F ring looking a little frazzled.
NASA UV Satellite Powers Down
After five years in orbit, CHIPSat enters a hibernation that may — or may not — be permanent.
Signs Found of Many “Super-Earths”
Jupiter-like exoplanets are outnumbered by smaller planets three to one, say astronomers describing their cutting-edge work in progress.
Jupiter Sports a Third Red Spot
Jupiter's new spot may herald global climate change for the gas giant.
Mars Rover Unearths Ancient Hot Springs
The Mars rover Spirit uncovers evidence for hydrothermal activity on the Red Planet and a possible cache for microbial fossils.
Puny Star's Big Flare Wows Astronomers
While a NASA satellite looked on, last month a red dwarf in Lacerta erupted with a titanic — and unexpected — burst of energy.