Ten to the third power means 10 x 10 x 10
and the answer to that is 1000
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103 = 1000
9,700
0.0064871
A very large number. One and one half times ten to the twenty third power is the current estimate of the number of stars in the universe! There are 500 billion stars in our Milky Way galaxy and there are 300 billion galaxies in the universe by the current estimate. If all of the other galaxies are the size of the Milky Way galaxy then the total number of stars is 1.5 times ten to the twenty third power!
1.7 x 10^-3 is equal to 0.0017