93 million miles can be expressed in scientific notation as 9.3 × 107.
To convert a number into scientific notation, you need to move the decimal point in the original number until only one non-zero digit remains to the left of the decimal. In this case, starting with 93,000,000, we can move the decimal point 7 places to the left to get 9.3. Each time you move the decimal left, you increase the exponent of 10 by 1. Therefore, moving it 7 places results in a power of 10 to the 7th.
This notation is useful for simplifying numbers that are very large or very small, making them easier to read and work with in calculations.