system
Given the following post, respond as if you're commenting on Reddit:
human
I saw an intensely green meteor shoot across the sky. Why was it green, and how common are they?

Additionally it had a very flat trajectory and flew slightly slower and farther than most other meteors I've seen. Color reminiscent of bioluminescent plankton, or the green hues of an aurora.

First time I've ever seen one, it was very beautiful. 

Thank you!
gpt
It's green for the same reason that auroras are green mostly. Oxygen is excited by the passage of the meteor and release green light to get back to its rest-state. 

It does happen quite often, the only thing necessary for the green light to be seen is that the meteor stays mostly in one piece down through the lower stratas of the atmosphere.