If you’ve seen astronauts returning to Earth you’ll have noticed that they have difficulty standing up because their muscles and bones have weakened. They also have problems with their vision, their sense of smell, and the bottoms of their feet. What happens in space that causes the human body to react and change?

Learn about rockets - what they are, the parts of rockets, and rocket missions.

Learn about the history of NASA's space shuttle program.

Table of Contents Home Away from Earth p. 4 Water World p. 6 Just Breathe p. 8 Changing Life p. 10 Gravity p. 12 Life on Mars? p. 14 Challenges p. 16 Terraforming p. 18 Growing Life p. 20 Artificial Structures p. 22 Getting There p. 24 Why Move? p. 26 In the Future p. 28 Glossary p. 30 For More Information p. 31 Index p. 32

"Presents information about icy dwarf planets, including fast facts, history, and technology used to study them"--Provided by publisher.

"Presents information about Earth, including fast facts, history, and technology used to study the planet"--Provided by publisher.

Presents information about the sun, including fast facts, history, and the technology used to study it.

"Presents information about Uranus, including fast facts, history, and technology used to study the planet"--Provided by publisher.

"Presents information about Jupiter, including fast facts, history, and technology used to study the planet"--Provided by publisher.

"Presents information about Venus, including fast facts, history, and technology used to study the planet"--Provided by publisher.