The find, which is several times older than the Egyptian pyramids, could rewrite the story of America's first human inhabitants.
The topic of UFOs seems to have become increasingly mainstream in recent years and shows no sign of slowing down.
The interstellar visitor is now thought to have been on a voyage across the stars lasting more than 12 billion years.
The greenland shark was always known to be long-lived, but it wasn't until now that it became clear just how long they live for.
The third batch of files is now available to view and download from the Department of War's website.
It has been over 22 years since the ill-fated Beagle Mars lander set down on the surface of the Red Planet.
The find suggests that early humans knew how to use fire hundreds of thousands of years earlier than previously thought.
The iconic Mars spacecraft has ended its mission after more than 11 years in orbit around the Red Planet.
The peculiar skulls, which exhibit strange, elongated craniums, have been the topic of debate and intrigue for years.
The ancient wonder of the world has stood for 4,500 years - but why haven't earthquakes caused it to collapse?
There's a chance that evidence of alien life has been under our noses for years and we have failed to see it.
For years, scientists have attempted to explain the nature and purpose of the huge stone jars littering the landscape.
The infamous vessel was found adrift and deserted in 1872, sparking a mystery that would endure for over 150 years.
Millions of years ago, enormous octopuses up to 62ft in length roamed the Earth's prehistoric oceans.
The discovery points to the building blocks of life being preserved on the Red Planet for billions of years.
It has now been six decades since what is perhaps Australia's most notable mass UFO sighting.
Around 65,000 years ago, something happened that might have ultimately doomed the Neanderthals to extinction.
Four brave souls will be blasting off atop NASA's Space Launch System (SLS) for the Moon later on today.
The object, which made headline news last year, appears to contain something that scientists were not expecting.
Scientists have identified what they believe to be the landing site of the short-lived Soviet spacecraft.