William Huggins observed one of these entities while studying the Cat's Eye Nebula, which led him to propose the element "nebulium.
William Huggins observed one of these entities while studying the Cat's Eye Nebula, which led him to propose the element "nebulium." The electronic transition of molecular hydrogen in quasars gives rise to a collection of these objects termed the Lyman Alpha Forest. Equal and opposite shifts of these phenomena due to Doppler (*) broadening is used to detect a certain class of binary stars. For the hydrogen atom, two of the "series" consisting of these things are named for Balmer and Paschen. For a blackbody, none of the "emission" type of these are present, but all "absorption" ones are present. For 10 points, name these "lines" that indicate what wavelengths a body emits or absorbs.
William Huggins observed one of these entities while studying the Cat's Eye Nebula, which led him to propose the element "nebulium.
spectral line [accept emission line or absorption line before read]