02. How big is our galaxy? (A K2S Question)

From The Space Library

The Milky Way Galaxy is very large, any way you look at it. It is about 100,000 light years across. That's really big. Our solar system orbits the galaxy, similar to the way the Earth orbits the Sun. The galaxy is so big that we have only completed one orbit—called a galactic year— since dinosaurs first appeared 220 million years ago. The Milky Way has around 400 billion stars in it!

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Answer provided by Jim Zebrowski

Question and Answer extracted from the book Kids to Space - by Lonnie Schorer

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