Near Miss Day
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It was the size of a mountain and came within half a million miles of collision with our planet ... and on the cosmic scale of things it is said to have been a very close call.
It is estimated to have an impact releasing energy equivalent to a 600 megaton atomic bomb. It would have been a cataclysm ... one of many we have avoided over the eons.
I personally feel that we will eventually have a comparable impact and hopefully the consequences will be somewhere less than an extinction level event ... but you can never tell when the Earth will simply have to start over on the evolutionary path due to such a collision of total devastation.