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How Fast Do Galaxies Move? An Interactive lab

How Fast Do Galaxies Move? An Interactive lab

Galaxies are so large, and so far away, that you could never see them move just by looking -- even if you looked for a whole lifetime through the most powerful telescope! Fortunately, there is a way to detect the motion of a galaxy: By examining the spectrum of light from a galaxy, you can determine whether the galaxy is moving towards or away from Earth, and how fast. In this interactive laboratory, you'll investigate for yourself how fast several galaxies are moving.

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