system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] Since Vibranium is an extraterrestrial material, how common is it throughout the universe ?
gpt
Gold is another extraterrestrial material, formed in the hearts of stars and released when they die, and we haven't found traces of it on other planets in our solar system.

Assuming Vibranium is an element with similar origins, its presumably higher place on the periodic table would reduce the number of stars capable of producing it, making it even more exquisitely rare.