Molecules in Space

        Went for my evening walk re-listening to the astronomy lecture on “Molecules in Space”. In the very early universe free protons flew around at very high energies and temperatures hitting each other and sometimes bonding to form molecular hydrogen (two protons: H2) which would cool down. Once enough molecular hydrogen was created and cooling down the universe to several thousand degrees, the first stars, hundred times larger than the Sun, could form. These massive stars had a lifespan of a million years or so until they went supernova creating heavier elements and cooling down the universe to a point where stars wouldn’t ever be that massive again. At least that’s how I understood it.