The material for galaxy halos
detected by the CU-Boulder team originally was ejected from galaxies by exploding stars known as supernovae, a product of the star formation process, Stocke of CU-Boulder's astrophysical and planetary sciences department said.
Cosmologists believe these orphaned stars produce the diffuse, blotchy smatterings of light that make up galaxy halos
extending well beyond the outer reaches of galaxies.
With the new spectrograph we can see galaxy halos
out to at least 150,000 parsecs.