https://astrobiology.com/2022/09/volatile-rich-comets-ejected-early-on-during-solar-system-formation.html
Comet C/2016 R2 PanSTARRS (hereafter C/2016 R2) presents an unusually high N2/CO abundance ratio, as well as a heavy depletion in H2O, making it the only known comet of its kind.
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