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Scientists Discover That Uranus Smells Like Rotten Eggs (space.com)
An anonymous reader writes: According to a study published in Nature Astronomy, scientists have determined that the atmosphere of Uranus smells like rotten eggs. The smell of Uranus was determined by the use of an Near-Infrared Integral Field Spectrometer (NIFS), an instrument that allows scientists to determine what an atmosphere is composed of based upon the reflections of sunlight that bounce off of it. Specifically, the clouds in Uranus' upper atmosphere consist of hydrogen sulfide, the molecule that makes rotten eggs so stinky. "If an unfortunate human were ever to descend through Uranus' clouds, they would be met with very unpleasant and odiferous conditions," study lead author Patrick Irwin, of Oxford University in England, said in a statement. But that wayward pioneer would have bigger problems, he added: "Suffocation and exposure in the negative 200 degrees Celsius [minus 328 degrees Fahrenheit] atmosphere, made of mostly hydrogen, helium, and methane, would take its toll long before the smell."
It's odd that the Oxford scholars didn't mention the toxicity of hydrogen sulfide, but mention suffocation from inhalation of methane and the effects of low temperatures. Although the odor can be detected at very minute concentrations, (around 0.000047 ppm) it's about as poisonous as cyanide at about 360 ppm. Suppression of the sense of smell doesn't happen instantaneously, and many deaths have occurred because victims who noticed the odor thought the gas had dissipated when they could no longer smell it.
Patrick Moore used to avoid this problem by pronouncing it your-uh-nuss, with the stress on the first syllable.
The original pronunciation of the name of the planet's eponymous Greek god almost undoubtedly was "oo-ran-os" (with the stress on the initial syllable), rather than "your-uh-nuss." The latter pronunciation is an artifact of British public school conventions, not authentic, classical Greek ones. (The Brits tend to Romanize both the English spelling and pronunciation of Greek words in general, and names in particular ... )
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Came to say this. H2S at around 100 ppm can/will deaden the sense of smell. Usually, the lack of instantaneous loss of olfactory functions can be attributed to the gradual increase in concentration of H2S in a given area during an incident.
But I guess saying Uranus smells like a bag of farts is more entertaining than actual science.
Beware of the Leopard.