The recent Gaia data release has made astronomical hearts flutter. Gaia is a satellite put in orbit by the European Space Agency (ESA). It's not taking pretty pictures like Hubble, it's been measuring the positions of things. Billions of stars and other objects.

But let's find out about it the easy way. Sit back and let Fraser Cain tell the story. Thanks To Gaia We Now Know Exactly Where 1.7 Billion Stars Are In The Milky Way