This is the YouTube channel of ESA's Gaia mission. This channel is meant for professional astronomers.
Gaia is collecting astrometry and photometry of more than a billion objects, as well as spectroscopy of the brightest 150 million of them, in order to decipher the structure, kinematics, and evolution of the Galaxy.
Gaia's data can be found on: http://archives.esac.esa.int/gaia
The Gaia mission home page is: https://www.cosmos.esa.int/gaia