A gas giant 520 light-years away has equatorial atmospheric motion approaching 33,000 kilometres per hour—around 16 times Neptune’s fastest winds. When announced in January 2025, it was the fastest planetary jet stream yet measured, although an even faster one was reported on another exoplanet just a month later.
For 28 days in early 2025, WASP-127b held one of planetary science’s most striking records. Atmospheric material around the equator of this distant gas giant was inferred to be moving at close to 9 kilometres per second, or approximately 33,000 kilometres per hour. That is around 16 times the strongest winds commonly quoted for Neptune, … Read more