It's a beautiful evening when Squeak, Orni, and Castor head out for a weekend of camping. But Squeak has a surprise: he's hosting them all in his observatory, high at the top of a tree. The tree house is delightful--and fully equipped for the most incredible discoveries: in the sky and the stars, through the galaxy and beyond. Readers join the three friends as they explore the night sky, our solar system, and how our universe was created.