BBC Two’s Stargazing Live physicist Gavin Hesketh explains how fast you would need to travel after viewer Karen asked “If you could travel into space and back, would you be as old as if you had stayed on Earth?”
BBC Two’s Stargazing Live physicist Gavin Hesketh explains how fast you would need to travel after viewer Karen asked “If you could travel into space and back, would you be as old as if you had stayed on Earth?”