Albert Einstein explained relativity as: Put your hand on a hot stove for a minute, and it seems like an hour. Sit with a pretty girl for an hour, and it seems like a minute. Scientifically, as you move faster, the time slows down for you. Cosmonaut Sergei Andreyev was in the ISS orbit for 748 days travelling 27,360 km/h. However, he aged roughly 0.02 milliseconds as compared to an Earthbound person. This is the longest time dilation experienced by a human being. So, time dilation can occur within the solar system. It is surely one of the surprising solar system facts you had not known!