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14. a distant galaxy appears to be receding at 45,000 km/s. how many light-years away is...

14. a distant galaxy appears to be receding at 45,000 km/s. how many light-years away is the galaxy?

answer. 2.1x10 to the 9th power

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Answer #1

The distance to the galaxy is the receding velocity divided by the Hubble constant

Hubble constant is

And 1 Megaparsec is

Therefore

The distance to the galaxy in lightyears is

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