#DidYouKnow: A polycyclic aromatic hydrocarbon (#PAH) is a class of organic compounds that is composed of multiple aromatic rings. The simplest representative is #Naphthalene.

They seem to have been formed as early as a couple of billion years after the Big Bang, and are associated with new stars and exoplanets.

More than 20% of the carbon in the universe may be associated with PAHs. PAHs are considered possible starting material for the earliest forms of life.

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