"There are a large number of planets, and most of them are small," Stern said.
行星数目众多，绝大多数都很小。
This family of planets, with their moons, is known as the solar system.
这个行星家庭以及它们的卫星，就是我们所知道的太阳系。
What, for example, is the fraction of planets that form life?
比如说，到底有多少行星上可以形成生命呢？
I saw there were people just like us on endless Numbers of planets.
我看到在无穷无尽的行星上有很多像我们一样的人。
Not until recently did scientists determine the number of planets in our solar system.
直到最近科学家才能确定太阳系中行星的数量。
One version of the definition would have actually boosted the number of planets to 12;
其中一个版本的定义将使得行星的数目大增，达到12个；
One version of the definition would have actually boosted the number of planets to 12;
其中一个版本的定义将使得行星的数目大增，达到12个；
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