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Which formed last: the visible halo, the galactic nucleus, or the disk? How do you know?

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  • Paula
    Lv 7
    2 years ago

    The disc formed last.

    "The gas from halo mergers goes toward the formation of the central galactic components, while stars and dark matter remain in the galactic halo"

    that's a quote from here. https://en.wikipedia.org/wiki/Galactic_halo#Format...

    So that means halo is formed before the disc and the nucleus

    next to form is the central bulge

    "Within a billion years of a galaxy's formation, key structures begin to appear. Globular clusters, the central supermassive black hole, and a galactic bulge of metal-poor Population II stars form."

    that's a quote from here https://en.wikipedia.org/wiki/Galaxy#Evolution

    So that leaves the disc to have been formed last.

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  • 2 years ago

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