The existence of ample amounts of hydrogen in the subsurface ocean of Enceladus indicates that microbes--if any exist there--could use it to obtain energy by mixing with carbon dioxide dissolved in water. This particular chemical reaction, termed methanogenesis, because it manufactures methane as a byproduct, may have been of critical importance in the emergence of life on our planet.
So here you have two definitions of a blue moon but the one for a calendar blue moon does not describe the true meaning of a blue moon. Here's why:
Scientists, seekers of truth by definition, would approach the subject from the null point of view, attempting to prove, in this case, that NASA DID go to the moon. Because the hoax theorists are taking the opposite tack, and because they stretch their case based solely on the photographic evidence, one must suspect both their academic pedigree and their intentions.