Scientists have hoped that Rosetta will show us a few things about the solar system's formation, such as if comets of its type brought water to Earth (the short answer is no) and what kind of life-bearing molecules could be on its surface. In late May, scientists announced that they had found the amino acid glycine, which they said is common in proteins and phosphorous (part of DNA and cell membranes).
It's the first time that glycine has been definitively found on a comet; while the Stardust mission found the amino acid in Comet Wild-2, those samples were suspected of contamination upon return to Earth.
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"We see a strong link between glycine and dust, suggesting that it is probably released perhaps with other volatiles from the icy mantles of the dust grains once they have warmed up in the coma," said Kathrin Altwegg, principal investigator of the ROSINA instrument that detected the gylcine, in a statement.
3. Going into Safe Mode, and Out Again