耶鲁大学研究团队通过分析古老的铁陨石，发现太阳系最早的固体天体形成过程具有高度的选择性1。这些早期行星体主要由高温形成的球粒组成，占比达83%-92%，而仅有8%-17%为基质物质，富含水冰的冷尘埃则被排斥在外1。该发现首次将这一行星构建的选择机制追溯到太阳系形成的最初100万年内，远早于此前确立的200-400万年时间点1。
研究团队由耶鲁大学助理教授Damanveer Grewal领导，他们利用硫含量和铁氧化状态两个独立的化学示踪剂重建了古代母体的成分1。Grewal表示："我们的工作表明，这一组合过程从一开始就具有显著的选择性。"1相关研究成果已于2026年9月18日发表在《自然天文学》杂志1。
A research team at Yale University has discovered that the earliest solid bodies in the solar system were predominantly composed of high-temperature chondrules, providing the first evidence that this selective planetary construction process occurred within the first million years of the solar system's formation.1 The study, led by assistant professor Damanveer Grewal, found that chondrules made up 83 to 92 percent of planetary bodies in the outer solar system's early stages, while water-rich cold dust was largely excluded.1
The researchers reconstructed the composition of ancient planetary bodies by analyzing iron meteorites using two independent chemical tracers: sulfur content and iron oxidation state.1 This analysis revealed that only 8 to 17 percent of the material in these early planetary bodies consisted of matrix material, with the remainder being high-temperature chondrules.1 "Our work shows that this assembly process was remarkably selective from the very beginning," Grewal stated.1 The findings, published in Nature Astronomy on September 18, 2026, extend evidence of this preferential planetary assembly process back to the solar system's first million years—substantially earlier than the 200 to 400 million years after formation that previous research had established.1
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