Did you know that the Milky Way is only one of billions of galaxies in the universe? Or that the planets in our solar system aren't the only planets in the Milky Way? Explore the Milky Way and our solar system's place in the galaxy.

שם הספר
Why Isn't Pluto a Planet?: A Book About Planets (First Facts)
The First Moon Landing (First Facts)
Space Probes (First Facts)
Space Stations (First Facts)