As of Nov. 5, 2014, there is no conclusive scientific evidence that supports the existence of extraterrestrial life. There are, however, some disputed pieces of evidence still undergoing further analysis. One is the hypothetical fossilized bacteria found on meteorite ALH84001, recovered in Antarctica.Continue Reading
Additionally, higher than expected methane findings in the Martian atmosphere in February 2005 suggested, but could not undeniably conclude, the existence of methane-producing bacteria on Mars.
The Drake equation, formulated by astrophysicist Frank Drake, is a theory that posits that, owing to the extremely large number of possible habitable planets in the universe, the probability of extraterrestrial life not existing is so infinitesimally low that it borders on impossible.Learn more about Astronomy