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Astronomers use light-years (ly) to measure distances in space because space is

simply so large. Light travels very fast, so it can easily be used to measure distances

without resorting to large scientific notation numbers. Inside the solar system, they

use the astronomical unit or AU. It is The distance from the Earth to the sun or

93 million miles.

Simply put: D. The distances are too great to measure in Earth units.

For example,

1 AU = 149,598,000 kilometers = 92,955,887.6 miles

1 ly = 9.4605284 × 1012 kilometers = 5.87849981 × 1012 miles

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