Surprisingly fast orbital speeds are seen for stars that are far from the galactic center.
A number of pieces of evidence, including the fact that material in the galaxy orbits the center too swiftly to be held together by the gravity of visible light, indicate that the majority of the Milky Way's mass, however, appears to be made up of a kind of matter that does not interact with
We detect atomic hydrogen clouds far from the galactic center orbiting the galaxy at surprisingly high speeds, faster than they would have done if they had only been attracted by the gravitational pull of things that we can see.
Surprisingly fast orbital speeds of stars located far from the galactic center imply that these stars are subject to the gravitational pull of as-yet-unobserved halo matter.
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