Why Are the Galilean Moons So Massive?
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Scientists propose that Saturn’s meddling helped create the four giant Galilean moons orbiting Jupiter.
The Jovian moon Europa, as captured by NASA’s Galileo spacecraft.
NASA / JPL / SETI Institute
Jupiter, with its 67 known moons, can be viewed as a miniature solar system revolving around the Sun. Four of these moons are large enough to be visible with even a small telescope. These so-called Galilean satellites — Io, Europe, Ganymede, and Callisto — are of nearly planetary size.
But scientists haven’t been able to explain how these moons became so big. Now, scientists have conducted a study to suggest that Saturn might be to blame.