Galaxies are held together by invisible halos
Invisible dark matter halos, making up 85% of the universe's mass, gravitationally bind galaxies together, preventing them from disintegrating and shaping cosmic evolution.
Galaxies like our Milky Way are encased in vast, unseen halos of dark matter. This mysterious substance doesn't emit or reflect light, making it invisible to telescopes, yet its immense gravitational pull keeps galaxies from flying apart. Astronomers like Vera Rubin first inferred its presence in the 1970s by observing stars orbiting unexpectedly fast far from galactic centers.
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