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Home Q & A Board Science-Related Homework Help Physics
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12 years ago
Recall that Hubble's law is written v = H0d, where v is the recession velocity of a galaxy located a distance d away from us, and H0  is Hubble's constant. Suppose H0  = 55 km/s/Mpc. How fast would a galaxy located 500 megaparsecs distant be receding from us? Show all work clearly, and state your final answer with a complete sentence. Give the speed in units of kilometers per second and as a percentage of the speed of light.
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12 years ago
The larger the value of Hubble's constant, the younger is the universe. This is because a larger value for Hubble's constant means the universe is expanding faster, which means it took less time to reach its current size.
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