The ESA mission Gaia, which is currently surveying the sky from the
Sun-Earth L2 Lagrangian Point, is providing astrometry of stars and
asteroids at few mas. The first Gaia Data Release, which
includes 2 millions of stars with position, parallaxes, and proper
motion and a position catalog of 1.1 billion of stars, has already
shown the strength of this unprecedented power of investigation.
The next Gaia data release in April 2018 will contain not only
billions of stars with proper motions and parallaxes, but also the