Someone light a match.

In a study making people everywhere giggle, researchers found that much of the upper atmosphere of Uranus is hydrogen sulfide. Thats the same compound responsible for some odors familiar here on Earth, including farts and rotten eggs.

If an unfortunate human were ever to descend through Uranuss clouds, they would be met with very unpleasant and odiferous conditions , Patrick Irwin from the University of Oxford, one of the studys authors, said in a news release.

On the other hand, the smell could quite literally be the last thing you notice.

Suffocation and exposure in the -200 degrees Celsius atmosphere made of mostly hydrogen, helium and methane would take its toll long before the smell, Irwin said.