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Gaia is an ESA-led satellite mission that maps billions of stars in our milky way and beyond, which, among many other things, will help find extrasolar planets.
To learn more, visit the Gaia mission page at ESA. For more scientific details including the data archive, refer to the Gaia page at ESA Cosmos. An article about the operation of the Gaia spacecraft can be found at ESA Spacecraft Operations.
You can read about the Gaia mission in scientific detail in the mission paper: Gaia Collaboration et al. (2016). A&A 595, A1
Artist’s depiction of the Gaia Space Telescope. Credit: ©ESA