对陨石球粒质地的研究证实，它们的冷却速度相当快，短则几分钟，长则数小时，因此形成陨石球粒的高温活动肯定是局部的。
Study of the textures of chondrules confirms that they cooled rather quickly, in times measured in minutes or hours, so the heating events that formed them must have been localized.
得出最老的陨石球粒的年龄，你就可以知道太阳是什么时候开始燃烧的。
Work out how old the oldest chondrules are, and you know when the sun ignited.
观察这些同位素可以估算出陨石球粒的年龄，他们是在45.6亿年前形成的。
Looking at these isotopes allows the chondrules to be dated, and they were formed 4.56 billion years ago.
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