Another "Great Spot" has been found at Jupiter, this one cold and high up.
It's in the upper atmosphere and much cooler than the hot surroundings, thus the name Great Cold Spot.
Unlike the giant planet's familiar Great Red Spot, this newly discovered weather system is continually changing in shape and size.
When the researchers compared the data with thousands of images taken in years past by a telescope in Hawaii, the Great Cold Spot stood out.
"The Great Cold Spot is much more volatile than the slowly changing Great Red Spot ... but it has reappeared for as long as we have data to search for it, for over 15 years," the University of Leicester's Tom Stallard, lead author of the study, said in a statement.
Stallard said Jupiter's upper atmosphere may hold other features.
Scientists will be on the lookout for them while also studying the Great Cold Spot in greater detail, using ground telescopes as well as NASA's Juno spacecraft in orbit around Jupiter, he said.
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