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

Humanity likes to think big. The largest man-made moving object in the world doesn't disappoint, with its sheer size dwarfing ...

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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.

Discover seven unusual galaxies defying scientific predictions, from impossibly bright early universe objects to astrophysics ...

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

Every week, Space.com delivers the latest discoveries, launches, and cosmic curiosities from across the universe. From groundbreaking research aboard the International Space Station to dazzling new ...

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.

Gas giants are large planets mostly composed of helium and/or hydrogen. Although these planets have dense cores, they don't ...

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