They're basically made up of debris left over from the origin of the solar system.
它们基本上是由太阳系起源时遗留下来的碎片组成的。
], we'll have a much better solar system origin model," says NASA's Pamela Clark, author of "Dynamic Planet: Mercury in the Context of its Environment."
，我们将有一个更好的太阳系起源的模型，说：”美国宇航局的帕梅拉克拉克，“动态行星：水星的环境”的作者。
The Oort cloud is a vast belt of dust and ice that is believed to lie around one light year from the Sun and is the origin of many of the comets that pass through our solar system.
奥尔特云是一个由粉尘和冰组成的庞大云带，据信它距离太阳约一光年，许多穿越我们太阳系的彗星都来自那里。
The isotopic composition of solar system is the base for studying the origin and evolution of the solar system.
太阳系原始同位素组成是研究太阳系起源和演化的基础。
(Astronomy) the nebular hypothesis of the origin of the solar system.
(天文学)关于太阳系起源的星云假说。
Thee Oort cloud is a vast belt of dust and ice that is believed to lie around one light year from the Sun and is the origin of many of the comets that pass through our solar system.
奥尔特云是一个由粉尘和冰组成的庞大云带，据信它距离太阳约一光年，许多穿越我们太阳系的彗星都来自那里。
Thee Oort cloud is a vast belt of dust and ice that is believed to lie around one light year from the Sun and is the origin of many of the comets that pass through our solar system.
奥尔特云是一个由粉尘和冰组成的庞大云带，据信它距离太阳约一光年，许多穿越我们太阳系的彗星都来自那里。
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