Life on Earth was kick-started thanks to a key mineral deposited by a meteorite from Mars, according to a novel theory aired on Thursday. The vital ingredient was an oxidized mineral form of the element molybdenum, which helped prevent carbon molecules — the building blocks of life — from degrading into a tar-like goo. The idea comes from Steven Benner, a professor at the Westheimer Institute for Science and Technology in Gainesville, Florida, who was to present it at an international conference of geochemists in Florence, Italy. "It's only when molybdenum becomes highly oxidized that it is able to influence how early life formed," Benner said in a press release. "This form of molybdenum couldn't have been available on Earth at the time life first began, because three billion years ago the surface of the Earth had very little oxygen, but Mars did." In this violent epoch of the solar system, the infant Earth was pounded by comets and aster...
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