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A skeleton with an unusual-shaped skull (pictured) has been unearthed on a site known as Russia's Stonehenge.
UFO enthusiasts were quick to claim it was proof aliens visited earth when it was first found The remains were found in Arkaim (shown with a red marker) near Chelyabinsk in central Russia.
O enthusiasts insist a small 'object' can be seen colliding with the meteorite on its trajectory through the atmosphere, despite the fact there were no reports of Russia launching missiles to down the celestial intruder, they claim.
Russia has called for major international efforts to develop the technology zap incoming space objects, but there is no suggestion any military strike was made at the meteorite on 15 February which was not spotted in advance.
It is just another of the mysteries to be unearthed at the spectacular site of Arkaim known as Russia's Stonehenge.
It is believed by some that, like its English counterpart, it was used to study of the stars, but Arkaim is thought to be more advanced.
The team estimated the massive collision happened up to 290 million years ago.
That’s a particularly hefty span of time, given that the average “lifetime” of a space rock in our solar system’s asteroid belt has been calculated to be less than 10 million years.
Based on the fragments’ composition and, in particular, the specific shape and distribution of jadeite crystals, the team determined that the parent body of the Chelyabinsk meteorite collided with another asteroid that was at least 500 feet (150 meters) in diameter.
The chunk of space rock that streaked across a Siberian sky in February 2013 left its mark via tweets and viral videos shared around the world.
But the fireball’s greatest legacy may be the insight it offers into the longevity of Near Earth Objects (NEOs) still out there.
The research indicates numerous kilometer-sized fragments from the giant impact struck main belt asteroids at much higher velocities than typical main belt collisions, heating the surface and leaving behind a permanent record of the impact event.
This image shows a meteorite fragment found after a 17-20 meter asteroid disrupted in the atmosphere near Chelyabinsk, Russia on Feb. The blast wave produced by this event not only caused damage over a wide area but also created a strewn field of stony meteorites like this one. It shows a beautiful contact between impact melt (dark material at top of image) and chondritic host (light material at bottom of image).