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American Focus > Blog > Tech and Science > Jupiter was once twice as large as it is today
Tech and Science

Jupiter was once twice as large as it is today

Last updated: May 20, 2025 1:34 pm
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Jupiter was once twice as large as it is today
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Jupiter, the largest planet in our solar system, is a behemoth with a diameter of over 88,800 miles, making it 11 times wider than Earth and twice as massive as all the other planets combined. However, recent calculations based on the orbits of some of Jupiter’s smallest moons suggest that the gas giant was once more than double its current size, with a magnetic field 50 times stronger. These findings, detailed in a study published in the journal Nature Astronomy on May 20, shed light on Jupiter’s early evolution and its impact on the formation of our solar system.

To unravel Jupiter’s ancient history, researchers focused on two of its tiniest moons, Almathea and Thebe, which orbit the planet at slightly tilted orbits above its cloudtops. By studying the dynamics of these moons’ orbits and the conservation of angular momentum, the team estimated Jupiter’s size and magnetic field strength 3.8 million years after the solar system’s formation. They found that early Jupiter was 2 to 2.5 times larger than it is now, with a much more powerful magnetic field.

Fred Adams, a co-author of the study and a professor of physics and astronomy at the University of Michigan, expressed amazement at the ability to reconstruct Jupiter’s early state after billions of years. By relying on measurable data from Jupiter’s moons and the laws of physics, the team was able to avoid many uncertainties that plague planetary formation models.

The new calculations not only enhance our understanding of Jupiter but also provide insights into the formation of other giant planets in our galaxy. The findings suggest that gas giants like Jupiter form through core accretion, where gas rapidly accumulates around a core of ice and rock. Konstantin Batygin, a planetary science professor at Caltech and study co-author, emphasized the importance of understanding the early stages of planet formation in unraveling the mysteries of our solar system’s origins.

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In conclusion, the study on Jupiter’s ancient history not only reveals fascinating details about the gas giant’s past but also contributes to our broader understanding of planetary formation and evolution. By delving into the secrets of our solar system’s largest planet, researchers are unlocking the mysteries of how the planets around us came to be.

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