Wow guys. Thanks for all the wonderful answers apparently the people that I heard reference this don't actually know what they are talking about. I'm going to read the articles at once.
Hello. So I always hear people say, "If someone flew in a ship at light speed to a far away star and then came back to earth, and it only took him two years to travel (the star being a light year away). When he came back all of his family/friends would have been dead for a long time." My...