This eight-metre hole in the ice of a lake near Chebarkul, Russia is reportedly where a meteorite came down on Friday. Photo: EPA

Wary earthlings watch sky in meteor's wake

Scientists at the US space agency Nasa estimated that the amount of energy released in the atmosphere above the Chelyabinsk region in the Ural Mountains was about 30 times greater than the force of the nuclear bomb dropped on Hiroshima during the second world war.