3 min learnNew DelhiFeb 10, 2026 08:32 PM IST
Scientists report that the photo voltaic system’s largest planet is barely slimmer than previous estimates, due to extra exact readings from Nasa’s Juno spacecraft. Concerning Jupiter, scientists who’ve studied our photo voltaic system’s largest planet have come to a brand new realisation: it will not be as huge as beforehand thought. Actually, Jupiter appears to be barely thinner and flatter. Whereas the change is small, the invention provides contemporary perception into the planet’s construction and behavior.
The findings have been printed on February 2 within the journal Nature Astronomy. Even with the revised measurements, Jupiter stays the biggest planet within the Photo voltaic System by a large margin.
For many years, Jupiter’s measurement was based mostly on knowledge from Nasa’s Voyager and Pioneer missions, which flew previous the planet almost 50 years in the past. These spacecraft employed a way generally known as radio occultation. In brief, they transmitted radio indicators by way of Jupiter’s environment. These indicators have been then despatched again to Earth. The bending of the indicators was studied to determine the approximate measurement of Jupiter.
Nonetheless, researchers now imagine these early estimates didn’t adequately account for Jupiter’s highly effective winds. Jupiter’s winds are so robust that they’ll distort its environment. This distortion can have an effect on the transmission and reception of radio indicators.
What Juno brings to the desk
Nasa’s Juno spacecraft, which has been in orbit round Jupiter since 2016, supplied an opportunity to reassess these figures with a lot higher element. Researchers analysed 24 new radio occultation readings taken throughout a more recent section of Juno’s mission, when the spacecraft handed behind Jupiter from Earth’s viewpoint.
“When the spacecraft strikes behind the planet, its radio sign bends because it passes by way of the environment,” mentioned Scott J. Bolton, Juno’s principal investigator, in a Nasa assertion. “This provides us a really exact solution to measure Jupiter’s measurement.”
Primarily based on the brand new evaluation, Jupiter measures about 83,067 miles from pole to pole and 88,841 miles throughout its equator. That makes the planet roughly 15 miles shorter on the poles and about 5 miles slimmer on the equator than earlier estimates urged.
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Whereas these variations could seem tiny for a planet of Jupiter’s scale, scientists say they matter.
Why the change issues
Specialists say the up to date measurement helps them higher perceive what is occurring deep inside Jupiter. “It’s not nearly realizing the precise radius,” mentioned planetary scientist Oded Aharonson, who was not concerned within the examine. “It helps us construct higher fashions of the planet’s inside.”
The brand new measurements are already bettering how nicely scientists can match Jupiter’s gravity knowledge with observations of its environment. As a result of Jupiter is commonly used as a reference level for finding out large planets past our photo voltaic system, the findings might additionally assist scientists higher perceive fuel giants elsewhere within the universe.
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