Such stars are of great importance as distance indicators, as the period of variation in the atmosphere is known to correlate with the overall luminosity of the star. Thought to be associated with the early lives of galaxies and perhaps results from the inflow of material onto a massive black hole. Careful measurements of the strengths of such lines can be used to infer the time since the star was born and, hence, provide crucial information on the age of the Universe. Good seeing corresponds to a spread in a point source of radiation to less than one arcsecond. Used by astronomers to infer the abundance of elements in a source.
Smaller wavelengths correspond to higher energies.