segue1_field

A failed and faintest galaxy ever detected provides new clues about the primordial Universe

Segue 1 is 50 times dimmer than the star cluster pictured above but is 1000 times more massive, meaning most of its mass must be made up of dark matter. (Credit: Sloan Digital Sky Survey)

Located some 75.000 light years from us, a galaxy known as Segue 1 has some unusual properties: it is the faintest galaxy ever detected. It is very small, containing only about 1.000 stars. And it has a rare chemical composition, with vanishingly small amounts of metallic elements present.

More at MIT: A “wimpy” dwarf fossil galaxy reveals new facts about early universe

arXiv: Segue 1: An Unevolved Fossil Galaxy from the Early Universe