This study helps us understand how the human body behaves in space to ensure the safety of future astronauts. This study also focuses on finding the long-term effect of space travel on astronauts.
As the name suggests, the study involves a set of twins who were studied by NASA. The motive is to explore how the human body is affected in space. For this, NASA observed twins Scott and Mark Kelly, who were both astronauts. Scott Kelly travelled to the International Space Station and is the first American person to spend a year in space. The other twin, Mark, was stationed on Earth.