Although space quests and inter-planetary explorations have failed and returned with no reports of signs of life other than here on earth, scientists have discovered some evidences that could lead to answers in the quest of extraterrestrial beings on other planets specifically Mars. Not one mission to Mars yielded confirmation of complex carbon-based molecules, of which life here on earth is founded and built. But interestingly, the surface of the Red Planet contains lots of sulfur, more than here on earth, key elements that might contain clues and signatures of primitive life forms that dwelled above the surface some millions of years ago.
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