NASA discovered that Uranus smells like rotten eggs

The clouds in the upper atmosphere of Uranus, the 7-th planet from the Sun, are composed largely of hydrogen sulfide, the molecule that makes rotten eggs so stinky, a new study suggests.”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.Researchers have long wondered about the composition of the clouds high up in Uranus’ sky — specifically, whether they’re dominated by ammonia ice, as at Jupiter and Saturn, or by hydrogen sulfide ice. The answer has proved elusive, because it’s tough to make observations with the required detail on distant Uranus.Not only are Jupiter and Saturn closer to Earth, they have also hosted dedicated orbiter missions. Uranus has been visited just once — a brief flyby by NASA’s Voyager 2 probe in January 1986.