Look at the DNA molecule shown at right. What does it look like?

When the electrons fall back down and leave the excited state, energy is re-emitted in the form of a photon. the wavelength (or equivalently, frequency) of the photon is determined by the difference in energy between the two states. these emitted photons form the element's spectrum.

The moon was formed by ejecta release when a mars- sized body collided with earth very early in its history.