Mysteries of Planets, Stars, and GalaxiesHardcover, 1 August 2020

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.