Fam­ily por­traits re­veal galaxy struc­ture

Science Illustrated - - SPACE TELESCOPES -

The Milky Way can be di­vided into three gen­eral el­e­ments: a thin disc, a thick disc, and a ball-shaped cloud, the halo. Gaia’s new mea­sure­ments of the bright­ness and mo­tions of the stars have al­lowed as­tronomers to cat­e­go­rize four mil­lion stars ac­cord­ing to their mass, age, and chem­istry. The Milky Way’s new fam­ily por­trait of any­thing from white dwarfs to red giants has been in­cluded into a Hertzprung Rus­sell di­a­gramme, that cat­e­go­rizes stars ac­cord­ing to bright­ness and tem­per­a­ture.

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