BEHIND THE SCENES
THE SKY AT NIGHT IN MAY BBC Four, 13 May, 10pm (first repeat BBC Four, 17 May, 7.30pm)*
A GALACTIC REVOLUTION
The Gaia mission is a project headed by the European Space Agency to make a 3D map of the Galaxy by studying over a thousand million stars. Following Gaia’s second data release, Chris and Maggie find out what we’ve learned and what it might reveal about the formation and evolution of our Galaxy.
*Check www.bbc.co.uk/skyatnight for subsequent repeat times
Gaia is expected to discover hundreds of thousands of new celestial objects