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The tale of trihydrogen

Four hundred light-years from Earth in the constellation Ophiuchus—known as the snake bearer because it resembles a man grasping a serpent—floats an interstellar dust cloud. This relatively dense gathering of molecules and particles holds the makings of two future stars. Made mostly of hydrogen gas, the cloud also contains helium and frozen dust grains of carbon and silicon sometimes coated with ice. The list of ingredients making up this star nursery is interesting, but perhaps pedestrian, to chemists on Earth. That is, until you get to the part of the list that mentions trihydrogen, or H3+. This unearthly molecule consists of three protons arranged in an equilateral triangle, sharing two electrons among them. The cloud’s temperature hovers a few tens of degrees above absolute zero. In this environment, atoms and molecules occasionally collide and then bounce apart unchanged because they don’t have enough energy to react. The highly reactive H3+,