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"To my knowledge, [this is the] first time an aurora driven by atmospheric winds has been detected," says Rosie Johnson, a space physics researcher at Aberystwyth University in Wales who is not involved with the study.
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Earth makes it easy to measure how long a day lasts: 24 hours.That's because our planet is covered in readily identifiable, fixed landmarks.
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You can't do this for worlds where the surfaces are obfuscated by thick gaseous veils, like Jupiter, Saturn, Uranus, and Neptune.
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In the summer of 2017, with its rocket propellant almost entirely spent, Cassini was ordered to plunge into Saturn's atmosphere so as not to risk crashing into and contaminating one of its potentially life-harboring moons.When it burned up in the Saturnian skies on September 15, 2017, the last great hope of cracking the case appeared poised to vanish with it.
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