When talking about the number of miles to other stars, it is best to use scientific notation.
Example:
2.38 x 1014 looks better than 238000000000000.
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0.0000034 2460000000 these are not in scientific notation
5, 800,000 and -23.5
Physicist, chemist, biologists, and doctors all use scientific notation.
0.002378 in scientific notation is 2.378 X 10 ^(-3); some write it as: 2.378E-3
Nothing is measured in scientific notation. Scientific notation is used merely to represent the result of some measurement - especially when that outcome is a very small or a very large number.