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Could there be other planets in the universe similar to those in our solar system? Yes! Scientists have discovered worlds circling distant stars. They call these objects exoplanets. In this book, you'll learn how scientists detect these faraway worlds. As part of the Searchlight Books™ collection, this series explores outer space and sheds light on the question: what's amazing about space?

As recently as 1990, it seemed plausible that the solar system was a unique phenomenon in our galaxy. Thanks to advances in technology and clever new uses of existing data, now we know that planetary systems and possibly even a new Earth can be found throughout galaxies near and far.