First data release of the ESA satellite Gaia
The ESA satellite Gaia released its first results based on observations collected by the satellite between 25 July 2014 and 16 September 2015. Gaia measures the positions, distances, space motions and many physical characteristics of more than one billion objects in our Galaxy and beyond. In this release, positions on the sky (α, δ) and magnitudes for more than 1 billion [...]