The missing nitrogen mystery: how a comet's dust revealed the building blocks of life
In short: For years, astronomers were puzzled by a nitrogen deficit in cometary gas. Now, data from ESA's Rosetta mission suggests the missing element was not actually gone. Instead, it was simply hiding within ammonium salts, which were detected during a daring, dust-filled flyover of Comet 67P/Churyumov-Gerasimenko.
During its mission to Comet 67P/Churyumov-Gerasimenko, the Rosetta spacecraft encountered a significant scientific enigma. While the comet's coma—the gaseous envelope formed by sublimating ice and dust—largely matched theoretical models, there was a glaring exception: nitrogen gas was present in much smaller quantities than expected. This depletion of nitrogen had remained a major open question in cometary science for some time.
Kathrin Altwegg of the University of Bern, leading the ROSINA instrument team, found the answer through serendipitous observations. During close flyovers in September 2016, Rosetta descended to just 1.9 km above the surface. Although the spacecraft became enshrouded in dust, temporarily severing communication with Earth, the ROSINA instrument successfully captured diverse mass spectra. The data revealed that the 'missing' nitrogen was actually tied up in ammonium salts, which are notoriously difficult to detect in space.
This discovery has profound implications for astrobiology. The presence of ammonium salts, alongside glycine, provides evidence of essential precursors to life. These compounds likely originated in the presolar cloud that formed our Solar System 4.6 billion years ago. Because ammonia can readily combine with acids in cometary ice to form these salts, they serve as a starting point for much more complex molecules, such as urea. By studying these chemical building blocks, researchers are gaining a clearer window into the primordial chemistry that may have eventually enabled life on Earth.
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Sources
- Summary by Intellect · source: ESA Euronews: Rosetta's quest for the origin of life
- Also: Building blocks of life spotted on Rosetta's comet hint at composition of its birthplace - Rosetta - Science Portal
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