What in the world is going on up there? Look up! It’s a bird; it’s a plane; it’s a Polar mesospheric cloud! When you look to the sky, do you wonder why the Sun is so bright or why the clouds are white or why the sky is blue? Then, Weather For Dummies is your resource to fuel your curiosity about the weather. It takes you on an exciting journey through the Earth's atmosphere and the ways it behaves.