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Kyiv, he claimed, was violating the international Chemical Weapons Convention with a variety of substances with the assistance of Western countries, including the psychochemical warfare agent BZ as well as hydrocyanic acid and cyanogen chloride.

Separating light from 2I/Borisov into its component parts, his team found a signature of cyanogen, a molecule made of a carbon atom and a nitrogen atom bonded together.

Spectra of the comet at first suggested it had an overall reddish hue and was emitting cyanogen gas, which is also found in Solar System comets.

Using telescopes on the island of La Palma in Spain’s Canary Islands, a team of astronomers led by Alan Fitzsimmons of Queen’s University Belfast detected cyanogen in the gaseous cloud around the comet.

Sadly, it’s not kryptonite, or even unobtanium, but cyanogen, a simple but toxic molecule made up of two carbon and two nitrogen atoms.