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The exoplanet HD 189733 b, a Jupiter-sized gas giant, has trace amounts of hydrogen sulphide, the researchers in the new study found.
As well as giving off a stench, this molecule offers scientists new clues about how sulphur, a building block of planets, might influence the insides and atmospheres of exoplanets - planets outside our solar system.
The planet is about 13 times closer to its star than Mercury is to the Sun and takes only about two Earth days to complete an orbit.
It has extremely high temperatures of around 927C and is known for vicious weather, including raining glass that blows sideways on winds of 5,000mph.
Guangwei Fu, an astrophysicist at Johns Hopkins University in the US, who led the research, said: "Hydrogen sulphide is a major molecule that we didn't know was there.
"We predicted it would be, and we know it's in Jupiter, but we hadn't really detected it outside the solar system.
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