In the early morning of July 25, 2001, a loud noise suddenly came over a small city in Kerala, India, people went out to look, found that the sky was actually raining "red rain", as bright as blood, in the next two months, 14 counties in Kerala have suffered 124 red rains, rivers, residents' clothes are often dyed "blood red", for such a scene, residents are very surprised, some think that this is a sign of imminent disaster, some people are worried that these rains contain polluting substances, It will affect your own health.
Subsequently, the researchers sampled and analyzed the rainwater, and found that it actually contained a lot of red cells that were very similar to animal red blood cells, although they did not have the function of red blood cells, but had obvious biological characteristics. Some people say that India has a large number of bats, the loud noise heard that morning, it is not good to be caused by the impact of burning meteorite fragments and a group of migrating bats, it happens that the sky soon began to rain, bat blood mixed with raindrops fell, but if it is really bats or other flying animals in the air that have been hit, their bodies should also fall to the ground, why only see red rain, not corpses? What's more, even if the first red rain can be explained by accidents, what about more than 100 red rains in the next two months? Are they all bats hitting meteorites? This speculation is clearly not valid.
In later studies, researchers put rainwater samples in extreme environments such as high temperature, high radiation, and high pressure, and found that the red cells inside were almost unaffected, and could even perform mitosis at a high temperature of 315 ° C. How can ordinary biological cells have such a strong vitality? As a result, many people exclaimed that these cells came from outer space! They are likely to come to Earth with meteorites or comets, and scatter in the clouds with the explosion of meteorites or comets, and then fall in the rain.
But soon, some scientists poured cold water, they pointed out that there are improper operations in these test experiments, such as some reagents used in the experimental process can improve the resistance of microorganisms to extreme environments, so it cannot be hastily assumed that these red cells come from outer space.
Later, some rainwater samples were sent to the United Kingdom for more sophisticated testing, and as a result, British researchers extracted some genetic material from it and claimed that they belonged to the spores of some kind of orange algae, and the Kerala region did grow this algae, and at this point, the mystery of "blood rain" can almost be declared solved, it may be that the spores of those algae are swept into the sky by the wind and then fall with the rain.
At present, this seems to be the most reliable answer, but there are still some difficult places to explain, such as the Kerala region from June to September, the climate is humid, the rain is abundant, and it does not meet the conditions for the production of orange algae spores - these spores often appear in the dry season, and even if there are spores that can be swept into the clouds at the beginning, but with the arrival of the rainy season, the ground is wet, and it is difficult to have a steady stream of spores being swept into the clouds, causing more than 2 months of red rain.
