Water on Earth was brought here by meteorites. Life on Earth was most likely brought here by carbonaceous meteorites. In the book, you will learn to recognize meteorites and to tell them apart from Earth rocks. You will learn where they come from, how old they are, and where to go hunt for them. Finally, we will introduce you to some of the most famous meteorites. Only twenty years ago, few people thought it was possible to own a piece of space, and even fewer believed that someday you would be able to touch, or even own, a piece of the Moon or Mars, but we do know now that about 50 meteorites from the Moon, and about the same number of meteorites from Mars, have been found right here on our planet.