Blood-red rain fell on India for two months and some physicists blamed a comet

From July to September two thousand one, Kerala experienced an extraordinary phenomenon: blood-red rain. Not just red—downpours came in yellow, green, and black too, sometimes all on the same day. According to Boing Boing, each milliliter contained about nine million tiny red particles, totaling fifty thousand kilograms over three months. The cause remains a mystery. Some physicists speculated a passing comet was responsible, though that theory never gained scientific consensus. Today, Kerala's strange red rain remains one of science's most puzzling unsolved cases.

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