The Human Research Program is NASA’s comprehensive effort to enable safe and productive travel for people in space. Now retired identical twin astronauts Scott and Mark Kelly took part in a year long mission to closely compare changes in their bodies. Scott spent more than 300 days aboard the ISS, while Mark remained on Earth. Both submitted to regular checks of their immune systems, genetics, bone formation, gut bacteria, the effects of vaccines, radiation and biochemical changes. The information recorded will be used for years to come to understand how to make a return journey to Mars survivable.
Further Reading
NASA’s Twins Study Results Published in Science Journal
Landmark NASA Twins Study Reveals Space Travel’s Effects on the Human Body
NASA’s Twins Study