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Astronomers deal with quantities ranging from the truly microcosmic to the macrocosmic.
It is very inconvenient to always have to write out the age of the universe as 15,000,000,000 years or the distance to the Sun as 149,600,000,000 meters. The general form of a number in scientific notation is a x 10 n , where a must be between 1 and 10, and n must be an integer. If the number is a power of 10, then it is not necessary to write that it is multiplied by 1. We move the decimal point two places to the right making 401. Convert 5.7 x 10 -3 .