For years, claims have circulated that red rain which fell in India in 2001, contained cells unlike any found on Earth. Now new evidence that these cells can reproduce is about to set the debate alive.
Panspermia is the idea that life exists throughout the universe in comets, asteroids and interstellar dust clouds and that life of Earth was seeded from one or more of these sources. Panspermia holds that we are all extraterrestrials.
While this is certainly not a mainstream idea in science, a growing body of evidence suggests that it should be carefully studied rather than casually disregarded.