The planets move around the sun in ellipses.
各行星按椭圆形运。
Galileo was forced to recant his assertion that the earth orbited the sun.
伽利略被迫放弃地球的断。
It is a tiny joyrider from the rubble stream surrounding the solar system that broke free and orbits the sun in a tilted, elongated orbit.
它是系而又自由浮动的一堆剩余物中游走出来的一颗星。它体积微小，以倾斜、细长的轨道着运。
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It takes a whole year for the Earth to go around the sun one time.
地球围公转一周需要一年。
The planet Kepler 69c follows a Venus-like orbit around a sunlike star.
开普勒69c围一颗类恒星运转，其轨道类似于金星围公转的轨道。
Asteroids orbit the sun but are much smaller than planets.
小行星围运行，但比行星小得。
Our earth and the other planets move round the sun.
地球与其他行星一样, 围运动。
Today you learned that comets are chunks of ice and rock that orbit the Sun.
今你学到了彗星是围旋转的冰块和岩石。
There's lots of controversy around solar geo-engineering and for good reason.
围能地球工程有很争议，这也是应该的。
That the moon moves around the earth and the earth around the sun is an authoritative opinion.
月亮围地球运转，地球围运转是权威的观点。
An exoplanet is a planet that orbits a star outside our solar system.
系外行星是围系外的恒星运行的行星。
Our planet goes around the sun and this creates night and day and the seasons.
我们的行星围运转，这带来了白夜晚和四季变换。
This tilt is what maintains the repeatable cycle of seasons, as the Earth orbits the Sun.
这个倾斜保持了季节的周期，随着地球围运转。
Galileo believed the Earth revolves around the sun. Ted Cruz believes the Earth revolves around Ted Cruz.
伽利略相信地球围转。泰德·克鲁斯相信地球围着泰德·克鲁兹转。
A day is only 9.9 hours long. And it takes 11.86 years to orbit the Sun.
木星上一只有9.9小时长。围转一圈需要11.86年。
Shortly after the Sun formed, you had a lot of material orbiting around the Sun.
很快地周围物质开始围旋转。
Well, it actually takes the planet Earth 365 days and six hours to revolve completely around the sun.
事实上，地球围公转一周需要365零6个小时。
All the other stars are called fixed stars, because they do not move round the sun.
其他星星则都被称作恒星, 因为它们没有围进行运动。
A lunar eclipse happens when the moon passes through Earth's shadow as our planet goes around the Sun.
当月球穿过地球围公转所产生的阴影部分时会发生月食。
He is the Sun. Everything else revolving around the Sun is a planet or a moon.
他就是一样的存在。其他围转动的都是行星或卫星。
It is also designed to study exoplanets - planets that orbit stars other than the sun.
它还被设计用来研究系外行星——围以外的恒星运行的行星。
Then there are Trojan asteroids, a large group of asteroids that share the orbit of planets around the sun.
还有特洛伊小行星，这是一群共享行星围运行轨道的小行星。
And they moved the line, figured out how planets worked, how they moved around the Sun.
他们移动了这条线，弄清楚了行星的运动轨迹，它们是如何围运转的。
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历史频道纪录片《宇宙》 历史频道纪录片《宇宙》 历史频道纪录片《宇宙》 学生科学读本 
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你学到了彗星是
