If you want to see what's out there in the Universe, you first have to be able to see. We take for granted, today, that the Universe is transparent to light, and that the light from distant objects ...

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Astronomers are getting some answers to an age-old question. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Paul M. Sutter is an astrophysicist ...

Shortly after the Big Bang, the universe was a dark and mysterious place. And I mean really dark — the gas between stars and galaxies was opaque, so no light could shine through. As anyone who's ever ...

THE universe is far more transparent at high energies than we thought. This discovery – based on sightings of unexpectedly bright objects that should be too far away to see so clearly – may call into ...

Neutral atoms were formed just a few hundred thousand years after the Big Bang. The very first stars began ionizing those atoms once again, but it took hundreds of millions of years of forming stars ...