Scientists are uncovering clues to our solar system’s chaotic past hidden in Uranus’s moons—suggesting two missing giant planets may have once roamed the outer solar system before being flung into deep space. New simulations show Uranus’s current moon system is nearly impossible to explain without major planetary upheaval, pointing to a violent era that shattered and rebuilt moon systems twice: first from Uranus’s dramatic tilt, then during a cosmic collision course. Miranda, a bizarrely patched and geologically active moon, may be a relic of that chaos—a shattered remnant of a larger body that survived to tell the tale. Future missions to Uranus could confirm if Miranda holds the key to unlocking how many planets our solar system once had.
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