system
Given the following post, respond as if you're commenting on Reddit:
human
Why is there a trail of red light lagging behind a moving red laser?

Hey! So I was playing with my cat (of course), and noticed when I was moving his laser around quickly, there was a "trail" of light behind it. Why is this?
gpt
This has to do with the eyes having a limited time resolution (a frame rate, if you will, but not literally) and not with the laser leaving a trail. Light from different locations (along the dot's path) is reaching your eyes faster than they are refreshing.