-Astronomy -Universe
-Cosmological distances -Measurement
-DistancesMost eight-year-olds are about five times as tall as this book . . . but only half as tall as an ostrich, which is half as tall as a giraffe . . . twenty times smaller than a California Redwood! How do they compare to the tallest buildings? To Mt. Everest? To stars, galaxy clusters, and . . . the universe?