From 25 July to 23 September 2001, red rain sporadically fell on the southern Indian state of Kerala. Heavy downpours occurred in which the rain was colored red, staining clothes with an appearance similar to that of blood. Yellow, green, and black rain was also reported. According to locals, the first coloured rain was preceded by a loud thunderclap and flash of light, and followed by groves of trees shedding shrivelled grey “burnt” leaves. Shrivelled leaves and the disappearance and sudden formation of wells were also reported around the same time in the area. A study commissioned by the Government of India found that the rains had been colored by airborne spores from a locally prolific terrestrial alga. Then in early 2006, the colored rains of Kerala suddenly rose to worldwide attention after media reports of a conjecture that the colored particles were extraterrestrial cells. The origin of the rain is still unknown today, despite worldwide efforts to discover the cause and true nature of the rain.