Uranus

Uranus stinks.

The Science is settled. Researchers have confirmed that the seventh planet from the sun has an upper atmosphere full of one of the smelliest chemicals known to humans, hydrogen sulfide, according to a study published by Nature Astronomy. The malodorous gas is what gives rotten eggs and human flatulence that distinctive and unpleasant stench.

There's a lot of really smelly stuff wafting around Uranus.

When You Just Can't Help Yourself

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• The enigmatic outer solar system planet has long had a credibility problem, what with it being the butt of countless immature jokes. Now, astronomers have just discovered a gas in Uranus' clouds that does nothing to curtail the giggles. At all.

• When you say the name of this planet, put the emphasis strongly on the first letter: “YUR-uh-nus.” This is considered the correct pronunciation and it prevents juvenile attempts at lowbrow humor, which are always fun, but will not be included in this article. Nor will we allow it to bias the question of which planet has the worst smell.

• At the risk of schoolboy sniggers, if you were there, flying through the clouds of Uranus, yes, you’d get this pungent, rather disastrous smell.