The black hole at the center of our galaxy is warping and combining stars into a strange new kind of object, astronomers say.
The US Navy confirmed they have secret, classified documents regarding a 2004 UFO encounter, but releasing them could 'gravely damage' national security.
A newly discovered suburb of baby-booming stars, known as the Radcliffe Wave, may be the largest structure in the Milky Way.
A private UFO enthusiast has donated his collection of 30,000 documents to the University of Manitoba in Canada. The truth is in there.
The ESA has announced a mission to launch a four-armed robot to grab a single piece of space junk and drag it into the atmosphere.
Long ago, millions of years before the first star sparked to life, the entire universe was a sea of darkness.
Hoag's object, which is a galaxy within a galaxy within a galaxy, has befuddled stargazers since astronomer Arthur Hoag discovered it in 1950.
At the edge of our solar system, a fierce battle rages between solar wind and interstellar rays. NASA's Voyager 2 spacecraft has now passed through the frontlines.
In 1987, a star exploded, creating the brightest supernova to light up Earth's skies in 400 years. That star's corpse has been missing for 30 years. Now, researchers think they've found it.
Curiosity is the last functioning rover on Mars, and its lonely mission has taken the robot to a steep mountain in the middle of a vast crater.
A nonprofit called The Earth Archive wants to make a 3D map of the entire planet, before the climate crisis changes Earth's face forever.
The mysterious Fermi bubbles at the center of the Milky Way may have been caused by a gargantuan nuclear explosion 3.5 million years ago, new research suggests.
The moon's South Pole-Aitken basin is one of the largest craters in the solar system, and a new study debunks the most popular explanation for its formation.
Remember those viral UFO videos you saw last year? The government would like you to forget them, please.
Two huge bubbles of radio energy swirling out of the Milky Way's middle could be evidence of an ancient cosmic explosion — or maybe the start of a new one.
Scientists spotted a mysterious blast of intense X-ray light flashing out of the distant Fireworks galaxy, and it's no mere supernova.
America's largest impact crater wreaked havoc on the land and water. Scientists are just beginning to understand it.
The moon may be dead, but the Apollo 11 astronauts still managed to bring extraterrestrial life back to Earth. Astronomer/alien hunter Seth Shostak explains.
There's a rebellious, half-dead star in the Little Dipper that's hellbent on escaping our galaxy — and now, astronomers have an idea why.
More than 200,000 Facebook users say they're interested in joining a raid on Nevada's infamous Area 51 air base this summer.
The biggest, oldest black holes in the universe shouldn't technically exist. A new study provides fresh evidence for the weird, "direct collapse" process that may have made them.