Earth is the only planet traveling within its nearly circular orbit around the sun. But what if Earth shared its orbit with another planet?
A viable nuclear fusion reactor — one that spits out more energy than it consumes — could be here as soon as 2025.
Remnants of water once found on the surface of Mars may be hidden in a handful of small lakes below the Red Planet's south pole, and more could exist, according to new research.
Unusual flashes of gamma rays could reveal that what appear to be giant black holes are actually huge wormholes, a new study finds.
What might Earth be like crowned with rings? Space and science- fiction illustrator Ron Miller created extraordinary images of how the sky might look if Earth possessed such rings.
Will the majestic redwoods of California's coast survive the lightning-sparked fires raging across the state?
Astronomers might detect black holes falling into wormholes via ripples in space-time called gravitational waves, a new study finds.
Scientists have generated an exotic form of matter in the unique microgravity environment aboard the International Space Station and are using it to explore the quantum world, a new study finds.
An exoplanet may be shaped like an American football due to the mighty gravitational forces it experiences close to its star, a new study finds.
The way the fabric of space and time swirls in a cosmic whirlpool around a dead star has confirmed yet another prediction from Einstein's theory of general relativity, a new study finds.
Researchers have discovered humanity's oldest cave art. The paintings depict a hunting scene with what may be part-animal, part-human figures.
Previous research had suggested that high-altitude regions such as Tibet and the Andes were among the last places peopled by humans.
Astronomers have shown that Einstein's ideas about the warping of space and time holds true as the best description yet of how gravity works.
From the 800s to the 1400s, about a dozen megadroughts struck the American Southwest, and all lasted longer than a decade.
Dead cells in the body don't sound very useful, but they might provide a new way to fight cancer, a new study in animals suggests.
Just a slight dip in the fertility rates of Neanderthals could explain their extinction over the course of several thousand years.
As if preparing for battle, some shrimplike creatures suit up in aluminum armor to survive the ravages of the deepest part of the oceans, a new study finds.
Mysterious "ghost apes" may have interbred with the great apes known as bonobos just as modern humans repeatedly had sex with now-extinct human lineages.
The event horizon is the threshold around the black hole where the escape velocity surpasses the speed of light. Here's what that means.