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Scientists don't know why, but one of Jupiter's two main cloud belts has disappeared -- again.
Originally posted by truth?
Jupiter cloud belt missing
Jupiter looks strange without that cloud belt. I wonder what causes it.
Orton says the belt may not be gone, just hidden under higher clouds.
"It's possible," he said on the NASA website, "that some 'ammonia cirrus' has formed on top of the SEB, hiding the SEB from view."
On Earth, NASA says, white wispy cirrus clouds are made of ice crystals. On Jupiter, the same sort of clouds can form, but the crystals are made of ammonia instead of water.