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The stars are much farther away than the planets. Astronomers uselight-yearsto measure big distances, where one light-year is the distance light travels in a year. The average distance between neighboring stars in the Milky Way is a few light-years. There are 5.8 trillion miles in one light-year. (Here’s another way to think about it: one light-year equals 63,000 AU.)
Our Milky Way Galaxy is about 100,000 light-years across. Traveling at the speed of light, how long would it take our spacecraft to travel across the Milky Way?
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