京都大学等日本和中国研究机构的科学家通过数值模拟发现，行星磁场强度是决定其卫星系统规模的关键因素。1研究显示，年轻时期木星强大的磁场在其周行星盘内形成了磁层空腔，有效保护了木卫一、木卫二和木卫三等大型卫星的存续。1相比之下，土星的磁场较弱，无法在其卫星盘内建立类似的保护机制。1
这一差异直接导致了两颗行星卫星系统的巨大差异。1木星现已确认拥有超过100颗卫星，其中包括太阳系最大的卫星木卫三在内的四颗特别巨大的卫星。1而土星拥有超过280颗已报告的卫星，但其卫星系统主要由土卫六主导，缺乏与木星相当的巨大卫星。1研究人员推测，土星较弱的磁场无法阻止迁移中的卫星离散，最终仅有土卫六得以在土星盘内存活。1
这项研究由第一作者尤里·藤井（Yuri I. Fujii）主导，利用日本国立天文台计算天体物理中心的计算机集群进行了N体模拟计算。1研究成果已发表在《自然·天文学》2026年第10卷第6期。1科学家表示，这一发现可能有助于解释系外行星周围卫星系统的多样性。1
Researchers from Kyoto University and other institutions have used numerical simulations to explain a striking difference in the moon systems of the two gas giants.1 Jupiter hosts over 100 known moons, including four exceptionally large satellites such as Ganymede, the solar system's biggest moon, while Saturn possesses more than 280 moons but is dominated by a single large satellite, Titan.1
The study, conducted using supercomputer simulations at Japan's National Astronomical Observatory's Center for Computational Astrophysics, revealed that Jupiter's powerful magnetic field created a protective magnetospheric cavity within its protoplanetary disk during its early formation.1 This shield allowed large moons like Io, Europa, and Ganymede to survive and persist in the Jovian system.1 By contrast, Saturn's weaker magnetic field could not generate a comparable protective zone, causing migrating moons to be destroyed as they passed through Saturn's disk, leaving only Titan to survive.1 The research, led by Yuri I. Fujii, was published in Nature Astronomy, Volume 10, Issue 6, 2026 (DOI: 10.1038/s41550-026-02820-x) and may help explain the diverse satellite systems observed around exoplanets.1
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