This enormous chain of hundreds of galaxies—a cosmic filament—is twisting through space 400 million light-years away ...

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Thousands of “city killer” asteroids remain undetected, NASA warns, and no ready spacecraft exists to stop one. A recent close call exposed gaps that scientists say still leave Earth vulnerable.

Many of us remember all too well our childhood bout of chickenpox: those itchy, scabby, red spots that appeared all over our ...

They show up as a mathematical solution in general relativity, basically as a time-reversed version of a black hole. Some ...

NASA officials warn that around 15,000 'city-killer' asteroids remain undiscovered, many lurking in a stubborn observational blind spot near the sun.

NASA planetary defense experts warn that up to 15,000 undetected asteroids could devastate a major city on Earth.

The James Webb Space Telescope and the Chandra X-ray Observatory have captured the clearest image yet of a galaxy cluster in the making, seen when the universe was only one billion years old.

Plans for several new military telescopes atop the mountain are drawing strong opposition. But protests over other Maui ...

How big would a telescope need to be to see Earth’s dinosaurs from 66 million light-years away? Think big—and then think ...

All the “normal” matter, like the stars, gas, dust, and people, is called baryonic matter, and it’s basically the tiny visible fraction of a universe that’s mostly invisible and still not fully ...

It took the artist half a century of toil in the most remote parts of Nevada to build what may be the most extreme ...