Astronomers found extreme winds on exoplanet WASP-127b reach 20,000 mph (32,000 km/hr). EarthSky’s Will Triggs explains in this short video.
- Extreme winds on exoplanet WASP-127b reach 20,000 mph (32,000 km/hr). These supersonic winds make up the fastest jet stream of its kind ever measured on a planet.
- ESO’s Very Large Telescope spotted part of the atmosphere of this planet is moving toward us at a high velocity while another part is moving away from us at the same speed.
- The fastest winds in our solar system are on Neptune. Those winds move at a comparatively “slow” 1,100 miles mph (1,800 km/hr).
ESO published this original article on January 21, 2025. Edits by EarthSky.
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Extreme winds on exoplanet reach 20,000 mph
Astronomers have discovered extremely powerful winds pummeling the equator of WASP-127b, a giant exoplanet. Reaching speeds up to 20,000 miles per hour (32,000 km/h), the winds make up the fastest jet stream of its kind ever measured on a planet. The discovery was made using the European Southern Observatory’s Very Large Telescope (ESO’s VLT) in Chile. It provides unique insights into the weather patterns of a distant world.
A windy, distant world
Tornadoes, cyclones and hurricanes wreak havoc on Earth. But scientists have now detected planetary winds on an entirely different scale, far outside the solar system. Ever since its discovery in 2016, astronomers have been investigating the weather on WASP-127b, a giant gas planet located over 500 light-years from Earth. The planet is slightly larger than Jupiter but has only a fraction of its mass, making it puffy. An international team of astronomers have now made an unexpected discovery: supersonic winds are raging on the planet.
Lisa Nortmann, a scientist at the University of Göttingen, Germany, and lead author of the study, said:
Part of the atmosphere of this planet is moving toward us at a high velocity while another part is moving away from us at the same speed. This signal shows us that there is a very fast, supersonic, jet wind around the planet’s equator.
At about 6 miles per second (or 9 km per second, which is close to a whopping 32,000 km/h), the jet winds move at nearly six times the speed at which the planet rotates. Nortmann said:
This is something we haven’t seen before. It is the fastest wind ever measured in a jet stream that goes around a planet. In comparison, the fastest wind ever measured in the solar system was found on Neptune, moving at ‘only’ 0.5 km per second (1,800 km/h).
The discovery of extreme winds on exoplanet WASP-127b
The team published their peer-reviewed research on January 21, 2025, in Astronomy & Astrophysics. They mapped the weather and make-up of WASP-127b using the CRIRES+ instrument on ESO’s VLT. By measuring how the light of the host star travels through the planet’s upper atmosphere, they managed to trace its composition. Their results confirm the presence of water vapor and carbon monoxide molecules in the planet’s atmosphere.
But when the team tracked the speed of this material in the atmosphere, they observed – much to their surprise – a double peak. This indicated that one side of the atmosphere is moving toward us and the other away from us at high speed. The researchers conclude that powerful jet stream winds around the equator would explain this unexpected result.
Further building up their weather map, the team also found that the poles are cooler than the rest of the planet. There is also a slight temperature difference between the morning and evening sides of WASP-127b. Fei Yan, a co-author of the study and a professor at the University of Science and Technology of China, said:
This shows that the planet has complex weather patterns just like Earth and other planets of our own system.
Advancing research on exoplanets
The field of exoplanet research is rapidly advancing. Up until a few years ago, astronomers could measure only the mass and the radius of planets outside the solar system. Today, telescopes like ESO’s VLT already allow scientists to map the weather on these distant worlds and analyze their atmospheres. David Cont from the Ludwig Maximilian University of Munich, Germany, and a co-author of the paper, said:
Understanding the dynamics of these exoplanets helps us explore mechanisms such as heat redistribution and chemical processes, improving our understanding of planet formation and potentially shedding light on the origins of our own solar system.
Interestingly, at present, studies like this can only be done by ground-based observatories. The instruments currently on space telescopes do not have the necessary velocity precision. ESO’s Extremely Large Telescope – which is under construction close to the VLT in Chile – and its ANDES instrument will allow researchers to delve even deeper into the weather patterns on far-away planets. Nortmann said:
This means that we can likely resolve even finer details of the wind patterns and expand this research to smaller, rocky planets.
Bottom line: Astronomers found extreme winds on exoplanet WASP-127b reach 20,000 mph (32,000 km/hr). These supersonic winds make up the fastest jet stream of its kind ever measured on a planet.
Via ESO