Hubble's Law (also known as the Hubble-Lemaitre Law) can be restated as:

A. The mass-to-light ratio of a spiral galaxy is greater if its rotational velocity is also greater.
B. The more distant a galaxy, the faster it is receding.
C. The rotation curve of a galaxy is related to the amount of mass inside.
D. The velocity curves of spiral galaxies only make sense if there exists a lot of unseen matter.


Ans: B. The more distant a galaxy, the faster it is receding.

Physics & Space Science

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