(10)1 = 10
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103 = 1000 10-3 = 0.001 or 1/1000
there are 10 raise to power 11 galaxies consisting of 10 raise to power 11 stars... so if around every star an earth like planet exists the probability goes to 10 raise to power 22
16
1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000
10 to the first power = 10