system
Given the following post, respond as if you're commenting on Reddit:
human
Is there any possibility that meteorites/asteroids have some new material? Like a new metal that doesn't exist in earth?

(I'm not sure if that's the best flair)
gpt
This depends what you mean by "material". 

If you mean element, probably not, as the majority of elements have been discovered and those that haven't have been theorised (i.e the periodic table). 

However a unique alloy or composition of elements with a unique structure that we haven't seen before is definitely possible.