A comet may have been the cause of the Tunguska event in Russia in 1908.

1908年可能是一颗彗星导致了俄国通古斯事件。

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The Tunguska event included seismic waves and infrasonic disturbances that were recorded around the world.

通古斯爆炸包含了地震波和次声扰乱，被世界各地记录下来。

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An asteroid or comet fragment around 60 meters across is believed to have been behind the Tunguska Event, a powerful explosion that took place over Russia in 1908.

据信，1908年俄罗斯上空发生的强劲爆炸——通古斯大爆炸背后，有一个直径约六十米的小行星或慧星碎片。

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Regardless, researchers are hoping that the Tunguska event can help them better prepare for future meteor collisions.

CNN: Tunguska

This Asteroid did not even hit the Ground and this is known by most as the TUNGUSKA EVENT.

FORBES: 'Doomsday Asteroid' Bigger Than Expected

If asteroids as big as DA14 pass close to Earth once every decade or two, and meteors as large as the Chelyabinsk one impact once every 100 years (a similar meteor having caused the Tunguska event in 1908), the chance of both events happening on any one day are indeed very small: 1 in 3, 650 days times 1 in 36, 500 days, or about 1 in 100 million -- not odds you would bet against.

CNN: A meteor and asteroid: 1 in 100 million odds