A collision with a Mars-size planet 4.5 billion years ago may have left a permanent impact on our planet's deep mantle.
The closer we look at the universe, the more beautiful and baffling it becomes. Here are the 10 most epic space structures discovered in 2021.
A bombshell UFO report, the "alien junk" in our solar system, and more new clues about extraterrestrial life.
A new pre-print study claims to have quantum entangled a tardigrade with two superconductor qubits, though experts are skeptical.
NASA and the Department of Energy hope to put a nuclear fission reactor on the moon by 2030, and they need your help.
Researchers rewound the history of the Magellanic Stream, and found it is 5 times closer to Earth that previously thought
A 54-page document co-written with engineer Michele Besso sold for a record-breaking $13 million at auction on Tuesday, Nov 23.
Scientists studying cosmic rays near the galaxy's center discovered a strange 'barrier' keeping the fast-moving rays from entering the Milky Way's middle.
What's the worst that could happen from the Russian missile test that blasted more than 1,500 pieces of space debris into Earth orbit?
A photographer in Zurich, Switzerland, spotted the glowing object while four SpaceX astronauts returned to Earth thousands of miles away.
An ultrabright, ultrafast explosion called the Camel lit up the sky for a month in 2020. Astronomers think it might have been the birth of a black hole or neutron star.
Physicists propose a new plan to "slice and dice" incoming asteroids that could save Earth from a deadly calamity.
NASA's DART mission will crash a spaceship into an asteroid at 15,000 mph. The mission launched in November.
NASA's Mars Reconnaissance Orbiter spied the little Perseverance Rover chugging around Jezero Crater in a striking new image.
Scientists have analyzed the enormous Bernardinelli-Bernstein comet, and predict it will come within 11 AU of Earth in the next 10 years.
In the star system GW Ori, three stars orbit one another. New research suggests there's probably a planet in the mix, too.
A moderate solar storm is headed for Earth on Sept. 27, 2021, with auroras predicted to light up the sky much further south than usual.
An asteroid measuring about three times the size of the Statue of Liberty will sail harmlessly by Earth on Sept. 22, the 2021 fall equinox.
ISS astronaut Thomas Pesquet captured a trippy new photo of orange 'airglow' streaming past the sideways Earth.
Scientists detected a repeating radio signal near the center of the Milky Way, and it's unlike anything else they've ever studied.
A catastrophic solar storm could take huge sections of the Earth offline for weeks or months, a new research paper warns.
Researchers studied geothermal heat flow below West Antarctica, and found that the infamous Thwaites Glacier is being disproportionately cooked from below.
Two aircrafts flying over Canada reported a "bright green UFO" that disappeared into the clouds on July 30.