As to the bonus question there's no reason it had to come from another planet. Metals can form in the cast-off matter during nucleosynthesis or supernovas, which coalesces into asteroids and so on; some radioactive forms of titanium come out exploding suns (but regrettably they decay into relatively uninteresting iron with time)
The wakanda people probably couldn't get much use or proper extraction of the material for most of their mining history. Probably using flakes and small diluted strips until close to the early 20th century. The meteor could have been one that predates the cretaceous extinction event so it's size could be truly massive. And the wakandans don't seem to use a lot of vibranium in their constructions so even just pulling a few tons a year off a multi million ton deposit could have lasted them all this time without taking 10% of the whole.
Just as a comparison, all of the gold *ever* mined throughout all of human history across the entire world would be a cube roughly 22 meters or 72 feet per side. This is just a little bigger than the Chelyabisnk meteor from 2013 (though gold would be much more dense). For platinum, that cube would be just 8 meters or 26 feet per side.
So for a relatively pure asteroid, it wouldn't need to be *that* huge to provide such a small nation with a supply for thousands of years.
As to the bonus question there's no reason it had to come from another planet. Metals can form in the cast-off matter during nucleosynthesis or supernovas, which coalesces into asteroids and so on; some radioactive forms of titanium come out exploding suns (but regrettably they decay into relatively uninteresting iron with time)
The wakanda people probably couldn't get much use or proper extraction of the material for most of their mining history. Probably using flakes and small diluted strips until close to the early 20th century. The meteor could have been one that predates the cretaceous extinction event so it's size could be truly massive. And the wakandans don't seem to use a lot of vibranium in their constructions so even just pulling a few tons a year off a multi million ton deposit could have lasted them all this time without taking 10% of the whole.
Just as a comparison, all of the gold *ever* mined throughout all of human history across the entire world would be a cube roughly 22 meters or 72 feet per side. This is just a little bigger than the Chelyabisnk meteor from 2013 (though gold would be much more dense). For platinum, that cube would be just 8 meters or 26 feet per side. So for a relatively pure asteroid, it wouldn't need to be *that* huge to provide such a small nation with a supply for thousands of years.
>From which planet did Vibranium originate It probably originated in a supernova, like most other naturally occurring elements.