One light year is approximately equal to seven trillion miles. So, 23 million light years is approximately equal to 161 quintillion miles. In scientific notation, that is 1.61 x 1020 miles.
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506,000,000 miles is 5.06*10^8 miles in scientific notation
5,870,000,000 miles in Scientific Notation = 5.87 x 109 miles.
1.42*108 miles
It is: 91,400,000 = 9.14*107 miles in scientific notation
1.86 x 10^5 miles/sec