A molecule found in interstellar space or comets

Our answer book holds 52 answers to “A molecule found in interstellar space or comets”, from the first thing anyone would say to names almost nobody would think of. Most people go straight for Water, Hydrogen or Carbon Monoxide, so those barely lift the rocket. It is a fairly short list: only 16 answers sit in the two rarest tiers, so reaching one takes real knowledge.

Space questions reward anyone who remembers the names behind the famous missions, not just the missions themselves. You will find it in stage 24, “Cosmic Forecast”, of the Cosmos mission. The first stages of every mission are free, and later stages come with the full mission.