|Space travel changes astronauts' DNA
Scientists found that our DNA can change in space. This change could increase astronauts' chances of getting cancer. The scientists did research on the blood of astronauts who flew on the Space Shuttle 20 years ago. They gave blood ten days before going into space and three days after coming back. Professor David Goukassian said astronauts work in an "extreme environment" where radiation and other factors could "result in mutations".