That’s a lot of zeros! Astronomers often deal with even larger numbers such as a trillion (12 zeros) and a quadrillion (15 zeros). When astronomers write these really, really big numbers, they use a shorthand called scientific notation. For example, instead of writing out a billion using nine zeros (like this: 1,000,000,000), they write it like this: 109. The little number 9 means there are nine zeros.
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