In the summer of 2003 a red rain fell over much of the Indian state of Kerala. People were obviously confused by this and gathered some of the red water and scientists started looking at it under a microscope.
Some scientists have proposed things like algae, red dust from the Arabian peninsula, even a flock of bats vaporized by a meteor. But Godfrey Louis, physicist at Mahatma Gandhi University, published a paper in the peer reviewed Astrophysics and Space Science hypothesizing that the red cells in the water are actually microbes from outer space.
Little tiny alien bacteria that came from somewhere and landed on India. The red stuff is thick-walled cell-like structures that are about 10 microns in size (that's small). Louis thinks they're alien because the "cells" have been seen replicating, yet don't seem to have any DNA (that's strange). They can also replicate in water heated up to 600 degrees Fahrenheit (the upper limit for life as we know it is 250 degrees). The thought is that the cells are really tough bacteria that evolved the ability to live on an asteroid or even just floating around in space.Here's the article.
Blood cells and dust don't replicate and fungus and algae have DNA. If this holds up the implications are obvious, and would be a big step in advancing the theory that life on Earth started when extraterrestrial cells (like maybe in a red rain) landed here billions of years ago. Other scientists are trying to replicate Louis' findings and their studies should be available later this year.