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Study Reveals Jupiter’s Early Size and Magnetic Power

New research confirms Jupiter was twice its current size with a magnetic field 50 times stronger just 3.8 million years after the Solar System began forming.

Overview

  • Researchers reconstructed Jupiter's primordial state using orbital data from its small moons Amalthea and Thebe.
  • About 3.8 million years after the first Solar System solids formed, Jupiter was 2–2.5 times its current size and had a magnetic field 50 times stronger than today.
  • The findings provide direct evidence supporting the core accretion theory, showing how a rocky core rapidly gathered gas to form giant planets.
  • Despite 4.5 billion years of evolution, subtle orbital clues allowed scientists to trace Jupiter's early physical state and contraction over time.
  • Jupiter continues to shrink by about two centimeters per year as it cools and loses energy, reflecting its ongoing thermal evolution.