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What Happened Before the Big Bang?
As we go back in time, we find that heat intensifies to such a level that all bonds that...
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An Otherworldly Discovery: Billions of Other Planets
Astronomers have determined that each of the 100 billion stars in the Milky Way probably has at least one...
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The First Oxygen Users?
None of us would be here today if, billions of years ago, a tiny, single-celled organism hadn’t started using...
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Can A Scientist Define “Life”?
Defining life poses a challenge that’s downright philosophical. There’s no ambiguity in looking for water, because we have a...
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‘El Gordo’ is Largest Distant Galaxy Cluster Ever Seen
Galaxy clusters are the largest stable structures in our Universe. Seven billion light years away and with two million...
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Star Birth (and Murder) Spied in Cygnus X
Baby stars don’t get an easy ride during their early years; they are born into stellar nurseries bubbling with...
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Hubble Spots Farthest Primordial Galaxy Cluster
Astronomers have discovered the most distant developing galaxy cluster known to date, shedding light on the formation of large-scale...
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Is Science Past the Big Bang Already?
While we have a supremely accurate theory of what happened after our universe started in its super-hot, super-dense childhood,...
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Physicist Writes How Universe Evolved From Nothing
In fall 2009, the theoretical physicist Lawrence M. Krauss gave a talk about recent discoveries in cosmology that he...
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The Next Ice Age and the Anthropocene
If you’ve wondered where to look for signs that Earth is entering a geological epoch of our own making,...