In 2010, the Cassini spacecraft captured the grand finale of a large storm on Saturn, consisting of a powerful discharge that sent the planet's stratosphere soaring 150°C above normal, coupled with a huge 'belch' of ethylene gas.
Ethylene isn't normally found on Saturn, and scientists aren't sure what caused the odourless, colourless gas to appear, and in such a large quantity.
According to researchers the gas spike contained 100 times more ethylene than scientists thought possible on the planet.
The temperature spike set a new record for the largest atmospheric change in Saturn's recorded history.
"This temperature spike is so extreme it's almost unbelievable, especially in this part of Saturn's atmosphere, which typically is very stable," said Brigette Hesman, the study's lead author, in a statement.
"To get a temperature change of the same scale on Earth, you'd be going from the depths of winter in Fairbanks, Alaska, to the height of summer in the Mojave Desert."
The findings will be published in an upcoming issue of The Astrophysical Journal.