Just how do you go about creating a 3D map of a galaxy? How many stars would that even be? And how can we know the distances to the stars if we can't travel to them?
Find out here how the Gaia spacecraft will answer these questions.
This cartoon is part of a series following one man and his cat as they learn about space, created by Angel Eye Media and the Gaia team in Cambridge. Narrated by Dara O Briain. You may download this cartoon in a range of formats from http://sms.cam.ac.uk/media/1638682.
More Gaia in one minute cartoons.
Page last updated: 06 October 2014