UFO sightings during NATO war games in 1952 set the stage for the season finale of "Project Blue Book," the History channel's series about the U.S.' real-life UFO-hunting program.
Chemicals in ancient ocean rocks hint that 3.2 billion years ago, the surface of a baby Earth was continent-free and covered by a global ocean.
In low Earth orbit's growing "space junkyard," new technologies could reduce the risk of collisions.
The U.K.'s Ministry of Defense announced that it will soon release formerly classified government files about UFO encounters.
A hypothetical timepiece called the Doomsday Clock measures our nearness to Armageddon — by nuclear weapons, climate change and other global threats.
Scientists recently identified the oldest material on Earth: stardust that's 7 billion years old, tucked away in a massive, rocky meteorite that struck our planet half a century ago.
Scientists have finally pinpointed the location of a long-hidden, 790,000-year-old impact crater, found under a lava field in southern Laos.
Scientists have released remarkably detailed maps of this pockmarked seabed of Bikini Atoll, revealing two truly massive craters from atomic bomb tests.
The story behind an oddball sky glow endearingly named "Steve" is revealed in a new documentary. Here's why the light show captivated aurora chasers.
Researchers recently captured the first images of a hidden "monster galaxy" as elusive as the mythical, monstrous yeti.
A new meteorite addition to the Field Museum's collection resembles a malodorous mud brick, but it holds important clues about the origins of life on Earth.
A fast-moving visitor is approaching our cosmic neighborhood. Dubbed 2019 SX5, this near-Earth object is about the size of the Great Pyramid of Giza.
The grim future of new TNT sci-fi series "Snowpiercer" began with climate change. Could our rapidly warming world undergo a global deep freeze?
A new book tackles the science behind the fantastic technology and sci-fi concepts in the outrageous cartoon series "Rick and Morty."
Twin baby stars snuggle inside a "pretzel" of glowing gas and dust in an image captured by the Atacama Large Millimeter/submillimeter Array telescope.
Students around the world were on the march, calling on global leaders to take meaningful action to curb human activity driving catastrophic climate change.
On Friday (Sept. 20), students around the world will walk out of their classrooms and gather in coordinated protests to highlight the global crisis created by climate change.
Hundreds of orbiting comets and asteroids are thought to present some risk of colliding with Earth, but the threat is typically very small.
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