Does life exist somewhere other than Earth? How many planets are outside our galaxy? What happens when stars crash into each other? For a long time, people believed Earth was the only planet in the galaxy. Now we know the universe is much bigger. Budding astronomers will learn all about planets, stars and galaxies, from what's already known to what scientists are still hoping to find out.
This is Book 4 in the Solving Space's Mysteries Series. See all Solving Space's Mysteries books here.
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