# Answer on Astronomy | Astrophysics Question for Carl Touchet

Question #72836

Consider a galaxy which is 100 million light-years away. Calculate its speed (in km/s), assuming that the Hubble constant is 22 km/sec/million light-years. Enter your answer in the blank (numbers only - no units!).

Expert's answer

The Hubble law states that

v=Hd

Thus

v=22 km/(sec/million ly)Ã—100 million ly

=2200 km/sec

v=Hd

Thus

v=22 km/(sec/million ly)Ã—100 million ly

=2200 km/sec

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