There are a wide variety of spacecraft, some of which are of human creation (SSP), and others which are not. Here is a chart of known shapes of spacecraft. Of course, if they’re up 100 miles and we use no magnification, all they look like are moving stars. Thing is, compared to us, stars don’t move.
When you see a “star” not only move, but leave orbit, it is something you’ll remember forever. Come see it happen.