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Children's LiteratureHumans are very curious. We want to know if there are other planets with living creatures like us in the universe. Astronomers are constantly looking for planets outside our solar system. Considering that there are billions and billions of stars in the universe, this is a monumental task. The job is made even harder because planets do not shine like stars and they are much smaller. How do astronomers try to find these elusive planets? Stars and planets attract each other by gravity. A planet's gravitational pull makes a star wobble a little. If astronomers can determine that a star wobbles, perhaps a planet causes the wobble. Astronomers can tell if a star is wobbling by looking at its light. If the light appears to alternate between being redder and bluer, then the star is wobbling. In 1995 Swiss astronomers discovered a star one hundred trillion miles from Earth that wobbled. They determined that a planet orbited the star. They named the planet 51 Pegasis b. This is a fascinating look at this question of other life in the universe and a tribute to the scientists who tackle this challenge. The text is succinct and easy to read with large color illustrations. 2004, Charlesbridge, and Ages 7 to 12.