system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How can we deduce the life cycle of stars, if humanity hasn't existed long enough to witness it?
gpt
Because there are a lot of the stars in the sky, all in different stages of their life.

It’s like if an alien came down to earth and had to figure out in a day what the life cycle of a human was. You just take a bunch of humans all in different stages of their lives and line them up in a way that seems to make sense. Then as years go by and some changes happen you see how well your first prediction lined up.