system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do constellations stay in their shapes year after year?

Edit: Thanks for all the awesome answers, you people rock!
gpt
Have your friend stand 100ft away from you and hold their hand straight up in the air. Then, have them move their hand an inch to the right or left. Were you able to see their hand move? Probably not since they were so far away.

Stars are so stupidly far away that they can move hundreds if not thousands of miles an hour relative to each-other, but as far as we can see they don't seem to be moving at all. Eventually the constellations *will* change shape, but it will take a very long time; much longer than humans will probably be around.