Gaia detector array, the most powerful digital camera ever built
Media playback is unsupported on your device

Gaia spacecraft: A billion pixels for a billion stars

20 December 2013 Last updated at 14:15 GMT

The European Space Agency has launched a spacecraft with one of the most high-powered digital cameras ever built.

It aims to create a three-dimensional map of the Milky Way by measuring the motion of stars over five years.

Pallab Ghosh reports.