Assuming The luminosity of the average galaxy is 1010 times larger than the Sun. Assume the Sun represents the average star with 1 solar luminosity and 1 solar mass. The Hubble Telescope tells us there are ~100 billion galaxies in the observable universe.

1) Estimate the number of stars in an average galaxy

2) Estimate the number of stars in the observable universe using the information in the previous question

Guest Mar 25, 2015

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