There are three naturally occurring isotopes of carbon on Earth:
carbon-12 (12C), which makes up 99% of all carbon on Earth; carbon-13 (13C), which makes up 1%; and carbon-14 (14C), which occurs in trace amounts, making up about 1-1.5 atoms per 1012 atoms of carbon in the atmosphere.
https://en.m.wikipedia.org/wiki/Carbon-14
Space, the universe and everything.
Space and the Universe.
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