It's probably in base ten because we use base ten for all our OTHER work in numbers as well. We learn to write numbers in base ten when in elementary school, and use base ten throughout our lives even if we aren't scientists or mathematicians or students or professionals who need to use scientific notation. So keeping scientific notation in base ten makes it easier for everyone to learn and read.
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Scientific notation is a way of representing numbers, usually very large or very small, in the form a*10^b where 1
700 ten thousandths in scientific notation is: 7e-2 or 7 x 10^-2
Scientific notation is used to show numbers raised to powers of ten. Pluto is a planet. Therefore, Pluto cannot be put into scientific notation because there are no numbers in Pluto to put to a power of ten...
.59 times ten to the power of ten
The scientific notation for sixty seven thousand five hundred and ten is: 6.751 × 104