Jupiter's moon Io has active volcanos spewing gases into its thin atmosphere. As Io moves in and out of Jupiter's shadow, its atmosphere collapses and then repairs itself.
Astronomers thought the star AR Scorpii was a lone variable star. Now they realize it's a dwarf star bombarding its companion with relativistic electrons.
A 1,600-foot (500-meter) dish called FAST - in southwest China - is now the world's largest radio telescope. It's expected to be fully operational in September.
Scientists had suspected that mountains on Venus affected weather patterns seen rippling across Venus' cloudtops. A new study provides evidence of this connection.