Learn about the theories behind the unusual dimming of Tabby's Star, from alien megastructures to an orbiting companion ...

A pair of classified videos allegedly showing a 100-foot black triangular UFO over a Colorado military base remain locked ...

A UFO researcher claims a Martian metropolis once existed on a vanished ocean's shore, sparking debate between enthusiasts and scientists over the Cydonia region's landforms and their origins.

NASA’s Nancy Grace Roman Space Telescope will soon launch to unravel the mysteries of dark energy and dark matter ...

Imagine a super-advanced alien civilization that needs insane amounts of energy way beyond our puny solar panels and wind turbines to power their mega-cities, AI overlords, or whatever interstellar ...

NASA began playing wake-up music for Gemini 6 in 1965, but it wasn't a regular routine until Apollo 10, leading to the '70s ...

Alan Dressler stared in awe at the line of Hubble telescopes stretching out in front of him. It took NASA two decades to design and build its own Hubble Space Telescope, which transformed our ...

On August 4, 1990, at around 9 PM, 2 unidentified hikers in the Scottish Highlands noticed a bizarre angular object hovering near Calvine, northwest of Perth, while jets flew in the distance.

A man who claims to be a time traveler from the year 2033 has shared a series of "shocking" predictions for the future of humanity, including the alleged arrival of aliens in 2028 and worldwide peace ...

After decades of secrecy, stigma, and sometimes silliness—like the conspiratorial tales about recovered spacecraft and alien ...

The Nancy Grace Roman Space Telescope will be the first space telescope to use an “active coronagraph” to block out unwanted starlight.

The Pentagon's latest declassified UFO files include unresolved cases like the Bagram triangle and a mysterious sphere in ...