Are we the aliens? Meteorites might have brought the stuff in our genes to Earth
Where does our stardust come from? It probably fell to Earth from outer space. While some nucleobases, which merge with phosphates and sugars to create DNA and RNA, were previously found in meteorites, this is the first time that any space rock has revealed all of them. “Previous extraction methods may not have been suitable for the detection of tiny amounts of these two bases,” he told SYFY WIRE.
Both the meteorite that HMT was extracted from and those which were hiding cytosine and thymine are carbonaceous chondrites. “We adjusted our analytical methods for the detection of tiny amounts of cytosine and thymine, and made improvements in sample purification and liquid chromatography conditions,” said Obe. Turned out that there was cytosine in all of the meteorites.
After testing the soil that surrounded these meteorites when they fell and finding that there were higher concentrations of some nucleobases in the space rocks, the researchers determined that those bases probably came from somewhere beyond Earth. "We expect to detect nucleobases and other N-heterocyclic molecules in the Ryugu samples,” he said. What is found in meteorites might change our perspective on not just how life came into being on Earth, but what extraterrestrial life could be like.
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