Milky Way mapper: 6 ways the Gaia spacecraft will change astronomy

From Nature:

C. Carreau/ESA

The Gaia spacecraft’s billion-pixel camera maps stars and other objects in the Milky Way.

Astronomers the world over are about to get their first taste of a tool that will transform their working lives.

Gaia, a space telescope launched by the European Space Agency (ESA) in late 2013, will release its first map of the Milky Way on 14 September. The catalogue will show the 3D positions of 2,057,050 stars and other objects, and how those positions have changed over the past two decades. Eventually, the map will contain one billion objects or more and will be 1,000 times more extensive and at least 10 times more precise than anything that came before.

The release next week will also include 19 papers by Gaia astronomers who have already seen the data. But independent teams are getting ready for their first glimpse. Lennart Lindegren, an astronomer at the Lund Observatory in Sweden and a major driving force in the Gaia project since it was first proposed in 1993, expects astronomers to produce 100 or so papers just in the weeks following the draft catalogue release.

Some groups have planned ‘Gaia hacking’ and ‘Gaia sprint’ events, at which researchers will collectively work out how best to exploit the sudden manna. “Gaia is going to revolutionize what we know about stars and the Galaxy,” says David Hogg, an astronomer at New York University who is leading some of these efforts. So what are some of the revelations that Gaia could make?


The structure of the Milky Way (artist’s impression) may soon be better understood.

Gaia’s 3D view of Milky Way in motion will reveal how stars move under its combined gravitational pull. This will add to knowledge of the Galaxy’s structure, including parts that are not directly visible from Earth, such as the …

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