What is a black hole? Readers will learn the answer in this book! They will discover how black holes form, what gravity has to with black holes, and how scientists observe these dark mysteries. Readers will also be introduced to other dark objects in the universe, such as black dwarfs, dark matter, and dark energy. Aligned to Common Core Standards and correlated to state standards. A&D Xtreme is an imprint of Abdo Publishing, a division of ABDO.