Absorption spectra are a result of light of a certain wavelength exciting an atom from a lower energy level to a higher one and at the same time being absorbed. However, the atom should eventually go back down to its lower energy state, and at the same time emit a photon of the same frequency it absorbed earlier. Overall, What changes should occur to the star's spectrum?
1) No changes should occur to the star's spectrum
2) The star's spectrum should become brighter
3) The star's spectrum should become dimmer
4) The star's spectrum should shift to a different wavelength