Elements crucial for life’s formation have been spotted around a comet which has been probed by the Rosetta spacecraft for almost two years. The discovery suggests that primitive life material could have been transported to our planet by comets.
Among the elements discovered were glycine and phosphorous, which are important components of DNA, RNA and cell-membranes. The European Space Agency’s Rosetta spacecraft spotted them in samples from a gas and dust cloud of the 67P/Churyumov-Gerasimenko comet, scientists said on Friday. It was the first time phosphorous was discovered around a comet.
“This result demonstrates that comets could have played a crucial role in the emergence of life on Earth,” scientists wrote in the paper published in the Journal of Science Advances.
Glycine was also detected back in 2006 in samples returned from another comet Wild 2. However they were said to have suffered contamination issues.
The fact that glycine was detected twice is no coincidence and means that it is a common element in the universe, scientists claimed.
“Having found glycine in more than one comet shows that neither Wild 2 nor 67P are exceptions,” said Kathrin Altwegg of the University of Bern in Switzerland, leading author of the paper.
“Amino acids are everywhere, and life could possibly also start in many places in the universe,” Altwegg added.
The “exact story” behind life’s formation on Earth is unknown and scientists have voiced different theories regarding the issue. One of them is that comets and meteorites landed into Earth’s oceans bringing organic components necessary to “generate” life.