Ingredient essential to life was brought to Earth by comets, astronomers say
Phosphorus, which is present in the DNA of all living organisms, may have been delivered by the icy wanderers billions of years ago.
A chemical element fundamental to all living things on Earth may have come from comet strikes, astronomers say.
A new study suggests phosphorus, which is present in DNA and cell membranes of all living organisms, may have been delivered by the icy wanderers billions of years ago.
Scientists found evidence of phosphorous monoxide in 67P/Churyumov-Gerasimenko, a comet belonging to the Jupiter family.
While phosphorus is considered one of the key ingredients of life alongside, carbon, hydrogen, nitrogen, oxygen and sulphur, how it arrived on the early Earth has remained a mystery to astronomers.
Victor Rivilla, of the National Institute for Astrophysics’s Arcetri Astrophysical Observatory in Italy and the lead author on the study, said: “Life appeared on Earth about four billion years ago but we still do not know the processes that made it possible.”
Observations showed that when massive stars are formed, they open up cavities in the surrounding interstellar clouds of gas and dust where phosphorus-based compounds, such as phosphorous monoxide, are created.
The astronomers then looked at data from the European Space Agency’s probe Rosetta, which was launched in 2004 to study 67P, and found evidence of phosphorous monoxide.
They say the findings allowed them to trace the journey of phosphorus from star-forming regions to comets.
Those dust grains gradually come together to form pebbles, rocks and ultimately comets, which then become transporters of phosphorus monoxide.
Kathrin Altwegg, of the University of Bern in Switzerland and one of the study authors, said: “Phosphorus is essential for life as we know it.
“As comets most probably delivered large amounts of organic compounds to the Earth, the phosphorus monoxide found in comet 67P may strengthen the link between comets and life on Earth.”
The study is published in the journal Monthly Notices of the Royal Astronomical Society.
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