Jupiter is Smaller and More ‘Squashed’ than Previously Believed, New Juno Data Reveal

Feb 4, 2026 - 17:30
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Jupiter is Smaller and More ‘Squashed’ than Previously Believed, New Juno Data Reveal
This visible-light image of Jupiter was created from data captured on January 11, 2017 using Hubble’s Wide Field Camera 3. Near the top, a long brown feature called a ‘brown barge’ extends 72,000 km (nearly 45,000 miles) in the east-west direction. The Great Red Spot stands out prominently in the lower left, while the smaller feature nicknamed Red Spot Jr. (known to Jovian scientists as Oval BA) appears to its lower right. Image credit: NASA / ESA / NOIRLab / NSF / AURA / Wong et al. / de Pater et al. / M. Zamani.

Using high-precision radio-occultation measurements from NASA’s Juno mission and incorporating the effects of zonal winds, planetary scientists derived Jupiter’s shape with an order-of-magnitude reduction in uncertainty, finding polar, equatorial and mean radii smaller than previous estimates made with NASA’s Pioneer and Voyager missions.

The post Jupiter is Smaller and More ‘Squashed’ than Previously Believed, New Juno Data Reveal appeared first on Sci.News: Breaking Science News.

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