Rourke Educational Media.

"Living in a world as vast as Earth, it can be easy to forget that this blue planet is actually a tiny speck within a massive universe filled with planets, moons, stars, asteroids, comets, dark matter--and maybe even alien life. Read about Earth's place in the Milky Way and the larger universe and how humans are learning about the endless frontier of space--and whether we are alone" -- Back cover.