Gaia measures with high precision the position and movement of stars, allowing to know the current and past state of the Milky Way formation and evolution. Over the five planned years of the mission, Gaia will observe every star about 70 times. Besides the astrometric measurements, Gaia observations will detect exoplanets, asteroids within our Solar System and new brown dwarfs, distant supernovas and quasars.
The Gaia mission has already released data on two occasions. The most recent of them is the Gaia Data Release 2, made public on 25 April 2018, and containing positions and brightnesses for nearly 1.7 billion stars and distances and proper motions for over 1.3 billion stars.
The Gaia group at ICCUB (IEEC-UB) is in charge of one of the most challenging aspects of the Gaia mission: the data managing and reduction process to yield the final Gaia catalogue. The ICCUB (IEEC-UB) has a leading role in the Gaia Data Processing & Analysis Consortium (DPAC), and it also takes part in the simulations, main processing and photometry.