system
Given the following post, respond as if you're commenting on Reddit:
human
What will the James Web telescope reveal about other planets?

I understand it's a long distance telescope but I heard it's also going to be used to study other world's outside our solar system. 

What kind of information are we talking about?
gpt
In terms of exoplanets one of the big goals is to do spectroscopy of their atmospheres, which would allow us to see their chemical makeup. This would tell us a lot about the conditions on these planets, and may also help in the search for life. For example, oxygen is very reactive and you wouldn't expect to see much in a planet's atmosphere unless something is replenishing it, as life does on Earth--though there are other possible sources, so it wouldn't be definitive.