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SlideshowReport

The Rotation Curves of Four Spiral Galaxies

Description
The Rotation Curves of Four Spiral Galaxies
This graph shows how the orbital speed of material in the disks of four spiral
galaxies varies with the distance from the center of each galaxy. If most of
each galaxy’s mass were concentrated near its center, these curves would fall
off at large distances. But these and many other galaxies have flat rotation
curves that do not fall off. This indicates the presence of extended halos of
dark matter.
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