In 1992, Dr. Mae Jemison made history by spending eight days in Earth's orbit, making her the first black woman ever to visit space. Twenty years later, Dr. Jemison is pushing space travel forward again with her 100 Year Starship Foundation. In this new True Book series, readers will join Dr. Jemison as she guides them on a tour of our solar system and explains how astronomers have used technology to discover new stars and planets. "This book explains...

You have probably seen movies or television shows about space travel. When space travelers go outside their ships, they use jet packs to tie themselves to their ships. They do this because outside their spaceships there is no force that keeps them attached to the craft. Without something to keep them attached, they would just drift off into space because there is no gravity. Gravity is also the reason why our bodies don't just fly upward into...

Explores oceans, discusses how they affect the climate, and describes the variety of life forms found there.

Describes the history and symbolism of the American flag.