The European Space Agency's next big planet-hunting mission - the Plato space telescope - will continue the search for rocky and potentially habitable worlds orbiting other stars.
A new simulation by scientists lets you witness supermassive black holes about to collide. One shows them from outside the system, just 40 orbits from merging. The other places you in their midst.
Last year, in its Grand Finale, the Cassini spacecraft dove repeatedly between Saturn and its rings. This week, 6 teams of researchers published new research based on Cassini's final days and those daredevil dives.
On both September 19 and 23, Arctic sea ice dropped to its minimum extent of 1.77 million square miles (4.59 million square km). The 2018 minimum ties for the 6th-lowest in the satellite record.