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In our own Milky Way, a recently deceased star creates a ghostly, hand-like shape in X-rays some 150 light-years wide. Here's how it's ...

Throughout history, "free energy" has been a scammer's game, such as perpetual motion. But with zero-point energy, is it actually possible?

There could be variables beyond the ones we've identified and know how to measure. But they can't get rid of quantum weirdness.

NASA's 1958 charter's top priority was, "the expansion of human knowledge of phenomena in the atmosphere and space." Is this how it ends?

For many of us, our imperfect vision compels us to wear corrective lenses to see properly. Here's what everyone should know about LASIK.

Across planet Earth, dark and pristine night skies are an increasingly rare resource. These photos showcase the best of what we still have.

The Universe was born incredibly hot, and has expanded and cooled ever since. Could life have begun back when space was "room temperature?"

Just 13.8 billion years after the hot Big Bang, we can see 46.1 billion light-years away in all directions. Doesn't that violatesomething?

Einstein is credited with saying, "If the facts don't fit the theory, change the facts." What he actually said has a very different ...

At the center of Hubble's famous "cosmic horseshoe," a very heavy supermassive black hole has been robustly measured. How is it possible?