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Supersonic Winds Blowing on an Extreme Exoplanet

Astronomers have analyzed the atmosphere of WASP-127b and discovered that its windspeeds reach 33,000 km/h. This is the fastest jetstream that's ever been measured on a planet—over 10 times faster than Neptune's winds, which are the fastest in the Solar System. The winds go 6 times faster than the planet itself is rotating. One clue is the extremely low density of WASP-127b; it's bigger than Jupiter, but a fraction of its mass. It's also tidally locked to its star.

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