Gaia is an European Space Agency (ESA) space observatory designed to map stars and other astronomical objects using Astrometry. It has two 1.45 x 0.5 meter telescopes viewing the Optical range as well as very Near Infrared (NIR). It was launched in 2013 for a five year mission at the L2 Earth-Sun Lagrangian Point. Instruments:
The Gaia-ESO Survey (GES) is a survey conducted with Gaia of 100,000 stars in the Milky Way.
European Space Agency (ESA)