Astronomers have found traces of ancient light in the activity of bright, distant galaxies. A new light detection will allow scientists to spot light from all of the distant stars in their field of view and going back into early of the formation in the universe. Researchers had to develop an indirect way to measure the light from the first stars. Imagine looking through a window on a rainy day, it's hard to see individual raindrops on their way down; but once you look at the ground you can see its all wet. To find the old light , researchers had to look at blazars. These are far away but super-bright galaxies that are held together by a giant black hold in the center. Light travels as tiny particles called photons. When photons smash into blazar's gamma rays, the collision dims the light from the blazars. Astronomers use data collected by the telescope to map the collisions.
http://www.sciencenewsforkids.org/2012/11/twinkle-twinkle-oldest-stars/
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