The well-preserved tracks were left in the silt by a species of bird that would have made even today's ostriches seem tame.
The remarkable sealed tomb, which is believed to date back 2,000 years, was found in Giugliano.
The creature, whatever it is, has sparked some heated debate online, with many dismissing the image as a hoax.
The spacecraft touched down in the Utah desert after a seven-year journey to and from the asteroid Bennu.
The discovery marks the oldest known evidence of wood logs being crafted and joined together to create a structure.
Fox Mulder himself has offered up a rather unconventional explanation for why aliens might visit the Earth.
Archaeologists have revealed the discovery of a unique and fascinating tomb in northern Peru.
Some conspiracy theorists had been expecting the non-existent planet Nibiru to collide with the Earth on Friday.
The immortal Star Trek actor called into question the idea that aliens would travel all the way to Earth and then 'hide'.
Palaeontologists have unearthed the fossilized remains of what could be the heaviest creature that ever lived.
Astronomers have been attempting to understand the nature of a distant object known only as GPMJ1839-10.
Archaeologists have unearthed two hand axes in deep Ice Age sediments - and they are absolutely enormous.
It might sound unthinkable, but is our universe simply the interior of a black hole that is situated within another universe ?
Pathologist Dr. Garry Nolan remains adamant that aliens have not only been to Earth already, but that they are still here.
This figure might sound a lot, but it is actually quite a bit smaller than previous estimates had suggested.
The space agency has stressed that there may be very little warning that a disruptive solar storm is about to hit the Earth.
China's answer to the X-37B has returned to Earth once again after nearly a year of unspecified activities in space.
A new study has aimed to determine whether Earth's radio and mobile tower signals could be picked up from other worlds.
A response to signals sent by some of our own spacecraft could reach Earth before the decade is out, scientists say.
Gold is a valuable and highly coveted resource - but just how much of the Earth's supply have we found so far ?