It’s actually Version 3who adds details at a temperature hundreds of millions These stars, their mass, colors, age, speed of movement and analysis more details From the chemical composition of millions of them. It also includes, for the first time, data on “seismic” – periodic oscillations on the surfaces of many stars.
Gaia is a space observatory of the European Space Agency (ESA) which, since 2013, has been “mapping” our galaxy, the Milky Way and its two billion stars, with the aim of making a so-called multidimensional map: this is the least position, but also the displacement and movement of the stars relative to us Occasion.
The “chemical map” in particular is a tool that astrophysicists have been waiting for in an attempt to reconstruct the history and locations of a star’s origin: the presence of a certain proportion of heavy elements, common to many scattered stars, may indicate that they originated in the same cloud of gas and dust, very far away. about their current location.
Image: Four ways to see our galaxy: The speed at which stars move, regardless of our field of view, interstellar dust and chemical composition.