system
Given the following post, respond as if you're commenting on Reddit:
human
Humanity has observed Supernovae. But have we also seen stars appear? I.e. them starting the fusion process?
gpt
The formation is too slow to notice changes over a human lifetime, or even the history of astronomy.

We have found many stars in all different stages of formation - instead of following them over time we can reconstruct the formation from looking at many stars together.