"With a double cover, one half of the book is focused on the sky during the day, while if you turn the book over the other half focuses on the sky at night. Inside, readers can discover all about airborne wildlife, weird weather, aircraft, stars and constellations, and their mythology. What do you see when you look up at the sky? It may seem like a big, empty space, but it's busier than you think. From clouds and stars, to birds, planes and everything in between--there's a whole sky to explore... Discover why the sky is blue, early experiments in flight, and how helicopters stay aloft, before flipping the book to read all about the night sky. Find out how to read the stars, spot the night's flying creatures and see the colors of the aurora borealis"--Publisher's description.