Satoshi Furukawa has been staying on the International Space Station since August last year. He and his fellow astronauts answered questions from Earth about their achievements so far.
Mr. Furukava is scheduled to stay for about six months, and is expected to return to Earth next month. He talked about an experiment that investigated how cells feel gravity, saying, if we can understand what is happening in cells, we will be able to deal with the deterioration of bones and muscles that occurs during spaceflight.