Newscientist reports on data from the Rosetta Space Probe, indicating that Comet 67P smells of a mixture of, cat urine, rotten eggs, and bitter almonds.
Apparently this means it's good news because the spectrometers on Rosetta weren't expected to detect such a variety until it got closer to the Sun. The spectrometer shows the molecules behind the smell are hydrogen sulphide, ammonia and hydrogen cyanide, mixed up with the frozen water and carbon dioxide of the comet.
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