Radioactive isotopes were found to produce amino acids inside carbonaceous chondrite meteorites.
Carbonaceous chondrites, a type of radioactive meteorite chock full of water and organic compounds, produce energetic gamma rays that can drive the chemical reactions to synthesize amino acids — the building blocks of life — researchers discovered.
Meteorites are leftovers from the formation of the young solar system’s rocky inner planets, which first clotted from the hot clouds of gas and dust billowing near the sun roughly 4.6 billion years ago. At the time, the planets were too close to the sun to form oceans and so couldn’t harbor life, leaving scientists puzzling over how Earth transformed into an oasis of life from its initial barren state.
It should be noted that amino acids can be made by many different processes, so while the mechanism the researchers have discovered is a possible candidate for how Earth was seeded by amino acids, it is not the only one. Future research will need to compare this mechanism with others to establish which one likely predominated during Earth’s earliest years.
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