A new study suggests that comets were the cosmic messengers depositing crucial elements like phosphorus on Earth billions of years ago.
Scientists know that the ingredients necessary to form life appeared on Earth early in its history, but they're still trying to figure out exactly how that happened.
"Life appeared on Earth about 4 billion years ago, but we still do not know the processes that made it possible," said Víctor Rivilla, lead study author and researcher at the Arcetri Astrophysical Observatory, part of Italy's National Institute for Astrophysics.In order to determine how phosphorus arrived on Earth, scientists needed to retrace its journey back through space.
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