Milky Way Formed Inside-Out

    Published: 06-16-2009
    Views: 6,601
    Data from ESO’s Gaia spacecraft is providing more information on the formation of the galaxy which suggests that it formed inside-out.

    Our galaxy most likely formed “inside-out” says new research from the Gaia-ESO project.  By looking at the “metallicity” of stars with a wide range of ages and locations in the Galactic disc, researchers found that stars located on the inside of the Solar Circle—the orbit of our Sun around the center of the Milky Way—are older stars while one’s inside the disc are younger.  They say their findings “provides exciting new evidence that the inner parts of the Milky Way’s thick disc formed much more rapidly than did the thin disc stars, which dominate near our Solar neighborhood.”