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Life on earth ’began on Mars’

Life on earth ’began on Mars’ 1

Evidence is mounting that life on Earth may have started on Mars. A leading scientist has claimed that one particular element believed to be crucial to the origin of life would only have been available on the surface of the red planet.

Professor Steven Benner, a geochemist, has argued that the “seeds” of life probably arrived on Earth in meteorites blasted off Mars by impacts or volcanic eruptions. As evidence, he points to the oxidised mineral form of the element molybdenum, thought to be a catalyst that helped organic molecules develop into the first living structures.

“It’s only when molybdenum becomes highly oxidised that it is able to influence how early life formed,” said Benner, of the Westheimer Institute for Science and Technology in the US. “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.

“It’s yet another piece of evidence which makes it more likely that life came to Earth on a Martian meteorite, rather than starting on this planet.”

All living things are made from organic matter, but simply adding energy to organic molecules will not create life. Instead, left to themselves, organic molecules become something more like tar or asphalt, said Prof Benner.

He added: “Certain elements seem able to control the propensity of organic materials to turn to tar, particularly boron and molybdenum, so we believe that minerals containing both were fundamental to life first starting.

[…]

“The evidence seems to be building that we are actually all Martians; that life started on Mars and came to Earth on a rock,” said Benner,…

Read the full article at: theguardian.com

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