If it did happen, would be something like meteor/comet or a solar storm.
Really? I thnk itis the one you didn't pick.
I can remember MT Pinatubo causing red Sunsets for an entire year. If 3 or 4 of them went off at hte same time we woulkd be ****ed.
Apparentlythere was some crazy eruptiojnj in India tens of thousands of years ago that killed most of humanity. THat is why Australian aboriginies are the closest genetic relative to original Aftricans.
**** this.... too much seriousnes. The world is going to end live it up.