“Alien” Life on Earth

NASA has discovered a microorganism in California’s Mono Lake which has replaced phosphorus with arsenic in its cell components. This is the first organism ever discovered to use arsenic in this manner, which expands the possibility for the search for life, both terrestrial and extraterrestrial. Until this discovery, carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur were considered the six basic building blocks of all known forms of life on Earth.

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