ESA’s Gaia is surveying stars in our galaxy and local galactic neighbourhood in order to build the most precise 3D map of the Milky Way and answer questions about its structure, origin and evolution.
Gaia’s engineering data have been accumulated over 18 months and combined to create this ‘map’ of the observed star densities, from which a beautiful and ghostly virtual image of our magnificent Milky Way galaxy can be discerned, showing the attendant globular clusters and Magellanic clouds.
Where there are more stars, as in the Galactic centre, the map is brighter; where there are fewer, the map is darker. The map includes brightness data corresponding to several million stars.
See http://www.esa.int/spaceinimages/Images/2016/11/Virtual_Milky_Way
