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?

The asteroid wars, bk. 3.

From the acclaimed author of New York 2140 and Red Mars, this NYT bestselling novel tells the story of a future where humanity has populated miraculous new habitats engineered across the solar system--and the one death that triggers a precarious chain of events that could destroy it all. Winner of the Nebula Award for Best Science Fiction Novel The year is 2312. Scientific and technological advances have opened gateways to an extraordinary future....

Kids can read series. Adaptation of author's Exploring space.