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1

Suppose a galaxy at a distance of 300 Mpc has a recession speed of 21,000 km/s. If its recession speed has been constant over time, how long ago was the galaxy adjacent to the Milky Way?
2

What is the Hubble time if Hubble's constant is 40 km/s per Mpc?
3

If the Hubble time is 20 billion years, what is the value of Hubble's constant?





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