The rotation curve of the Milky Way galaxy is non-Keplerian at large distances from the center.This is evidence for

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Quizplus · Accepted Answer

The non-Keplerian rotation curve at large distances from the center of the Milky Way galaxy indicates the presence of large amounts of unseen mass in the outer galaxy or halo. This is known as dark matter, which does not interact with light or other forms of electromagnetic radiation, but can be detected through its gravitational effects on visible matter. Alternatively, there have been some studies that suggest that modified theories of gravity, rather than dark matter, could also explain the non-Keplerian rotation curve, but this remains an area of active research and debate.

The Rotation Curve of the Milky Way Galaxy Is Non-Keplerian