Add Yahoo as a preferred source to see more of our stories on Google. Twin brothers and former NASA astronauts Mark and Scott Kelly have each flown four missions and were part of NASA's twin study to ...

NEW YORK -- You would expect a trip to space to be transformative, but NASA says it can lead to permanent DNA changes. The space agency studied the DNA of twin astronauts Scott and Mark Kelly. Scott ...

NASA has launched its latest mission to study Mars, with a little push from Jeff Bezos' space company Blue Origin. Hitching a ride on a Blue Origin New Glenn rocket, NASA's pair of Escapade (Escape ...