6th Century Comet Linked to Plague and Crop Failure

Cardiff University: Scientists at Cardiff University have new theories about a 6th century comet which may have collided with the Earth. "Nuclear winter," or something very like it, may have already happened around 540 CE according to astronomers at Cardiff University. They have been studying the effects of a comet which may have collided with the earth, causing cold summers, crop failures and possibly the Justinian Plague. Researchers are studying tree rings as well as investigating the "panspermia" theory where "the Earth was seeded in the past, and is still being seeded, with microorganisms from comets." This theory could explain the sudden appearance of diseases such as Black Plague and Spanish Influenza.

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