Two siblings going to bed describe what stars really are--giant balls of hot, dense gas millions of miles from the Earth--in a book that examines constellations, atmospheric turbulence, and black holes.

"Written by an expert in astrophysics to the classic melody of 'Twinkle twinkle little star,' this book is the perfect introduction to the real science behind the magic of stars. Discover how stars are created, what they're made of, and even what makes them look like they're twinkling" -- Book jacket flap.