The asteroid was 'the same size' as the meteor which exploded over Chelyabinsk injuring 1,500.
Scientist Vladimir Surdin believes 'silver clouds' were the cause of the multi-coloured night sky witnessed by thousands of people.
Expedition from Urals Federal University finds 300 samples of suspected space debris, clues to the history of the universe.
The meteorite that crashed to Earth in the Urals was attacked by a UFO causing it to explode and shatter, it was claimed on Thursday.
The city of Chelyabinsk cleared up its broken glass and divers scoured a lake to find a meteorite which hit with the force of a nuclear bomb.
Sensational pictures of last week's meteorite strike have emerged from a Russian photographer.
Russian scientists hopeful of finding traces of cosmic matter left after the explosion.
Or was it a meteor lighting up the early morning sky over the Pacific port?
Expedition by leading chemistry institute finds area where it fell.