The Dark Destroyer
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Though everyday Earth receives tones and tones of space material, collisions with large space objects are very rare events.

The last such event to occurred happened, apparently above Tunguska, Siberia, in 1908, unfortunately the event going unnoticed by any human being, though heard by many people many thousand of miles away.

It is said by the brilliant statisticians that there are far more chances of someone being knocked down by a bus than a meteor colliding with Earth, but the problem here is that when a meteor ( be it an asteroid or a comet) plunges into Earth it would produce an explosion hundred thousand times that of the Hiroshima bomb bringing on destruction at an apocalyptical proportions, and eventually completely wiping out macro life.

Sixty four million years ago such an event happened on Earth, entirely wiping out the mighty dinosaurs who had been living on Earth for millions and millions of years.

Besides wiping out life, an object the size of UK can fragment Earth into obliteration.

The 1994 collison of Shoemaker-Levy 9 comet with Jupiter is the first ever witnessed and real-time analysed poignant example of this kind of catastrophe.

The impact of the largest rock (3km) had generated an explosion (6 million megatons equlivent to 80,000 Hiroshima bombs) that had been observed near Earth, 928,081,020 million km away, showing a large plum cloud of gas and dust that was about the size of the Earth, and had lasted for a month.

The largest nuclear weapon ever detonated was the Tsar Bomba, which had a yield of 57 megatons.

With new knowledge of our solar system and advances in technology, we have acknowledged that there are many potential Earth collision objects (especially asteriods) in our backyard.

In the words of Ripley (Aliens): " if one of those things gets down here ......"

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