Theory: Earth life has extraterrestrial origin: DNA brought by meteorites
DNA elements confirmed to come from outer space. Photo: tgdaily.com
Although the DNA components found in meteorites in the 60s were excluded, being considered the effect of terrestrial contamination of the meteorite fragments, a new analysis suggests that it is very unlikely that adenine, guanine (elements of DNA nucleobases) and other found molecules to originate from Earth.
Michael Callahan, an astrobiologists at NASA, says that nucleobase components discovered in meteorite fragments are not found together in any terrestrial organism. Comparing the number of nucleobases found in meteorites and those from Antarctic ice, it was observed that the ice provides by far fewer nucleobases and less variations.
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The team concluded that the DNA components were built in the meteorites, by a non-biological process. Such a process was successfully restored in a laboratory experiment, involving a chemical reaction in which cyanide, ammonia and water were used.
“We’ve got for the first time three premises that give us reasons to believe that DNA elements were created in space,” said Callahan.