kunwardeep25 wrote:
Can someone please explain 116?
Hello friend, it is a combination of this twoparts:
Quote:
Instead we have found that the rotational velocity in spiral galaxies either remains constant with increasing distance from the center or increases slightly.
and...
Quote:
It has been known for some time that outside the bright nucleus of a typical spiral galaxy luminosity falls off rapidly with distance from the center.
...
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