NASA's Osiris-REX mission has found evidence of ancient water flows on the surface of asteroid Bennu.
New analysis of data from the European Space Agency's Mars Express orbiter strengthens the case for salty lakes underneath Mars's south polar cap.
Colder weather might be coming, but don't pack away that telescope! You'll miss a powerful storm that's remaking Jupiter's North Temperate Belt, a returning comet, Mira on the rise, and a bright supernova in the Great Bear.
Radio observations have turned up evidence of a cloud of hot plasma near — or even in — the solar system. But its distance estimate is still up for debate.
The Hayabusa 2 team has laid out a proposal for an extended mission to one of two asteroids after the spacecraft's sample return this December.