I am sure everyone has seen Interstellar movie. In the movie, Cooper proposes to orbit around Gargantua, parallel to Miller's planet, to escape from the time dilation. One hour in Miller's planet is equal seven years in Earth's time. My question is, what would it look like, if we happen to view people on Miller's planet through a giant telescope from the spaceship? The spaceship is Earth's time and the miller planet is time-dilated. Would they appear to move slow? Or no difference at all? If no difference at all, then how come Cooper didn't age but Rom ages by 23 years?