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Jupiter was 2.5x bigger billions of years ago, study reveals
May 26, 2025
04:43
Jupiter, the solar system’s reigning giant, was once even more massive—a staggering 2.5 times its current size—according to groundbreaking new research. The study, published in Nature Astronomy, suggests that in its infancy, Jupiter’s gravitational dominance played a pivotal role in shaping the entire solar system.
With a mass already 2.5 times greater than all other planets combined, Jupiter’s early expansion challenges our understanding of planetary formation. Astronomers Konstantin Batygin from Caltech and Fred Adams of the University of Michigan analyzed the orbits of Jupiter’s moons Amalthea and Thebe, uncovering clues about the planet’s ancient past.
The researchers found that just 3.8 million years after the first solid materials formed in the solar system, Jupiter was already twice its current volume. Its immense gravity not only influenced the formation of neighboring planets but also set the stage for the solar system’s architecture.
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“This brings us closer to understanding how not only Jupiter but the entire Solar System took shape,” Batygin said.
The study supports the bottom-up model of planet formation, where dust and rocks gradually coalesce into planetary bodies. While terrestrial planets like Earth formed this way, Jupiter’s growth trajectory was different—once it reached about 10 times Earth’s mass, its gravity began pulling in vast amounts of gas, transforming it into the gas giant we know today.
Amalthea and Thebe, two of Jupiter’s small inner moons, provided critical evidence. Their orbits are slightly tilted relative to Jupiter’s equator—a detail that allowed scientists to trace their movements backward in time.
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“It’s astonishing that even after 4.5 billion years, enough clues remain to let us reconstruct Jupiter’s physical state at the dawn of its existence,” Adams remarked.
The findings indicate that Jupiter underwent a phase of rapid expansion when the solar system was still in its infancy. At its peak, the planet’s magnetic field was 50 times stronger than it is today, further influencing the dynamics of the early planetary neighborhood.
The discovery not only sheds light on Jupiter’s past but also offers insights into how gas giants form in other star systems. By studying these ancient clues, scientists can refine models of planetary migration and the forces that sculpt young solar systems.
As researchers continue to decode the mysteries held by Jupiter’s moons, one thing is clear: the king of planets was once an even greater titan—one that shaped the destiny of every world around it.
This article Jupiter was 2.5x bigger billions of years ago, study reveals appeared first on BreezyScroll.
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