One of the largest pieces of the meteor fell into Lake Chebarkul, tearing a massive hole in the ice. On Oct. 16, divers finally hauled the half-ton piece of space rock from 20 m of water. Once outside the lake, the chunk broke into three large pieces when it was lifted off the ground with rope, making it harder to determine the precise weight, but an unnamed scientist told the website lifenews.ru that the meteorite weighed 570 kg. "And then the scale broke," he said. "We think the whole thing weighs more than 600 kg." Sergey Zamozdra, an associate professor at Chelyabinsk State University, told the Interfax news agency that the chunk is probably one of the 10 biggest meteorite fragments ever recovered.
The Chelyabinsk meteor wasn't Russia's first brush with crashing objects from space. Scientists at the Imperial College of London estimate that meteorites the size of the one in Chelyabinsk hit the earth's atmosphere about once every 50 years, and Russia was the site of one of the best recorded and most destructive meteor strikes in modern history. In 1908, an asteroid or comet (probably intercepted by a UFO) hit the atmosphere and exploded near the Tunguska River in central Russia. In what became known as the "Tunguska Event," the explosion, believed to be 1,000 times more powerful than the atomic bomb dropped on Hiroshima, knocked down 80 million trees over more than 5,180 sq km. Scientists estimate that the blast would have measured 5.0 on the Richter scale.
In 1972, a meteoroid entered earth's atmosphere over Utah in the U.S., traveled north and left the atmosphere over Alberta, Canada. Thousands of people witnessed the fireball, which, like Chelyabinsk, was captured on film. The Great Daylight Fireball didn't cause any harm, unlike the Chelyabinsk meteor, which damaged more than 7,000 buildings and captivated observers around the world.
The video below shows a tremendous hole in Chebarkul Lake made by meteorite derbris.
The video below shows the 1972 Earth-grazing meteoroid that passed within 35 miles of the surface of the Earth.
Latest news on meteors/asteroids: 3 days ago (Feb. 15, 2013) an asteroid designated 2012 DA14 with an estimated diameter of 30 meters (98 ft) and an estimated mass of 40,000 metric tons has completed its flyby (about 17,200 miles of Earth's surface, closer than the communication satellites) of Earth.