But when they looked for the source, there was nothing there, no planet, no star.
但是当他们寻找其源头时，却发现那里什么都没有：没有恒星，也没有行星。
Illustration: Planet and moon cross in front of star.
插图：地球和月球在恒星前方交叉。
This artist's conception shows a hypothetical young planet around a cool star.
这幅艺术想象图表现了一颗围绕着冷却恒星的年青行星。
This artist's concept shows the smallest star known to host a planet.
这张艺术概念画展示了已知最小的拥有行星的恒星。
Sirius, brightest star in planet Earth's night sky is at the far right.
天狼，行星地球的夜空中最明亮的恒星，在画面右边。
But WD 0806-661 B is not a planet - it's a very small star.
但是WD 0806- 661B号星球并不是一颗行星——而是一颗非常小的恒星。
We're on some planet, obviously, with a green sky and a double star for a sun.
显然我们是在某个星球上，有绿色的天空和两颗星星代替太阳。
Welcome to planet Earth, the third planet from a star named the Sun.
欢迎来地球，一颗被称作太阳的恒星的第三颗行星。
There is, however, a planet known to orbit backwards around its parent star.
然而，还有一颗绕着母星逆行的行星。
However, if you see it move from one group to another, then it is not a star but a planet.
然而，如果你看到从一个星群移动到另一个星群，那他不是一颗恒星，是一颗行星。
It is the fourth planet in orbit around the star Felix.
它是围绕恒星费利克斯旋转的第四颗行星。
The planet is probably in orbit around a small star.
这颗行星可能正环绕着一颗小恒星运行。
One option is to leave for another planet or another star system.
有个选择就是离开地球到另一个行星或另一个太阳系去。
Star System: Sirius a - Planet: toleka.
天狼星a恒星系统——toleka星球。
Star System: Vega - Planet: Percula
织女星恒星系统——Percula星球
Star System: Arcturus - Planet: pitolla.
大角星恒星系统——pitolla星球。
Star System: M103 - Planet: legola.
大角星恒星系统——pitolla星球。
The planet and the star both orbit around a common centre of mass between them.
地球轨道的明星都围绕一个共同的质量中心之间。
Star System: Capella - Planet: Pershea
小犬座南河三恒星系统——Kaena星球
The nearest star, Proxima Centauri, has a planet orbiting it not much bigger than Earth.
有一颗大小与地球相近的行星围绕着距离太阳最近的恒星——半人马座比邻星运转。
Star System: Antares - Planet: Nikotae
天蝎座白星心宿二恒星系统——Nikotae星球
The commonest way offinding a planet is to look for a star that wobbles.
通常，探测行星最普遍的方法就是探测一颗波动的恒星。
A planet is a celestial body orbiting a star.
行星是环绕著恒星公转的天体。
Yes, ' the old man said. ' This is the planet of the Star Council so there is always work here you can do. I'm sorry. '
“是的。”那老者说，“这是星际理事会所在的行星，这儿总有你能做的事。对不起。”
Not a star. The planet Jupiter.
但那并不是一颗恒星，那是行星木星。
The were stunned to find a rocky planet so near a star, he said.
天文学家对于发现一颗岩石行星如此靠近一颗恒星感到震惊，他说。
As a planet orbits, it pulls a star back and forth.
当一颗行星绕它的轨道运行时，它能来回牵引恒星。
As a planet orbits, it pulls a star back and forth.
当一颗行星绕它的轨道运行时，它能来回牵引恒星。
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