For the 1st time, astronomers have detected the faint radio afterglow of a ghost explosion – a kind of cosmic sonic boom – possibly the result of a weird kind of gamma-ray burst.

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.

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.

The Goblin is a very small dwarf planet, very far away. It might help astronomers in their search for a much bigger world – the long-sought Planet X.