there are many ways that a photon be generated from an atom or a molecule. A planetary nebula is a cloud of gas surrounding a glowing star. Please see the accompanying photo for reference. The gas is comprised of molecules, but for the purpose of the assignment we can assume that they′re just atoms with electrons. Photons leave the nebula and hit my eye, allowing me to see it. Photons are also leaving the star. How was the photon that hit my eye produced?