The number of stars in the Milky Way Galaxy is approximately ? a few million ? a few billion ? a few hundred million ? a few hundred billion
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Step 1: The Milky Way Galaxy is estimated to contain between 100 and 400 billion stars. Show more…
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Express the number of stars in a typical galaxy in scientific notation
Sri K.
Let's suppose that the average mass of a star in the galaxy is one-third of a solar mass. If the mass of our Galaxy is about 100 billion solar masses, estimate how many stars are in the Milky Way.
Penny R.
Our Milky Way galaxy contains perhaps 400 billion stars. Suppose that $0.05 \%$ (i.e., 0.0005 ) of these stars have planetary systems containing at least one Earthlike planet (one that could conceivably support Earthlike life). Express these two numbers using powers of $10,$ and then multiply them together to find how many Earthlike planets there are in our galaxy. Express this number in words (thousands or millions, etc.).
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