Astronomers spot leftover light from ancient stars
Photons leave their mark in high-energy radiation from powerful galaxies
By Nadia Drake, 17:03 PM November 1, 2012
Light from the universe’s very first stars still lingers in space. Now, astronomers have a new way to catch it: Distant, ultra-bright galaxies that act as cosmic beacons, capturing relict photons in a blaze of gamma rays.
But it’s not just these earliest photons that are snared; photons from every star that ever shone can be captured. “We now have constraints on the total number of stars that ever formed,” Volker Bromm, an astronomer at the University of Texas at Austin, says of the new w...
Source URL: https://www.sciencenews.org/article/astronomers-spot-leftover-light-ancient-stars