Everlasting light

Remnant glow of ancient stars offers glimpse of universe's past

12:41pm, August 23, 2013

ALL STARS' LIGHT  A superbright galaxy called a blazar sends out a flood of  radiation in this illustration. On its way to Earth, some of that radiation  slams into vestiges of light from all the stars that have ever existed.

On the next clear night, go outside and look up. If you’re away from city lights, you may be amazed by the darkness of the sky between the stars. But what looks like inky black isn’t really so. Even the darkest of night skies still contains the light of all the stars that ever shone.

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