In 2001, nearly 50 tons of blood-colored rain fell in parts of India. Physicist Dr. Godfrey Louis believes that these unusual red particles (pictured, magnified 500 times) are alien microbes from outer space, which entered Earth's atmosphere on a comet or meteorite. Some of Louis's experiments suggest that the strange red cells may lack DNA yet still reproduce, even in superheated water. Read more from Popular Science(1).
Photo: Dr. Godfrey Louis

1. http://www.popsci.com/popsci/science/2c21c0f98d07b010vgnvcm1000004eecbccdrcrd.html