NASA may have found alien life on Mars then accidentally destroyed it, scientist claims

One of humanity's greatest mysteries might have been solved 50 years ago - but NASA might have destroyed all evidence of it.

Since its formation, the space agency has performed a series of projects to chart the landscape of Mars and to search for evidence to prove the existence of extraterrestrial life on the Red Planet.

One scientist believes that NASA may have already found such evidence, but that bungling scientists might have accidentally "destroyed" it.