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Astronomers’ main reference guide to the Milky Way has received a major update. The Gaia mission, a spacecraft that is tracking nearly two billion stars, has released a vastly improved map, which now includes the 3D motions of tens of millions of stars and thousands of asteroids — as well as the detections of stellar ‘quakes’ and of possible extrasolar planets. The European Space Agency (ESA) launched its 2-tonne Gaia probe in 2013.