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Assume that there are 1.03 × 1012 galaxies in the universe, that the average galaxy has...

Assume that there are 1.03 × 1012 galaxies in the universe, that the average galaxy has a mass equivalent to 5.70 × 1011 average stars, and that an average star has a mass of 1 × 1030 kg. Ignoring dark matter, how much mass (in kilograms) does the universe contain?

If the mass of an average particle of normal matter is 1 × 10–27 kg, how many particles are there in the entire universe?

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