如果一颗星随着时间的推移变亮和变暗，这可能就是一颗绕轨道运行的行星的迹象。
If a star gets brighter and fainter over time, this could be a sign of an orbiting planet.
用它来观看光谱迹象，即一颗恒星因为受到一颗绕轨道运行的行星的引力而在晃动。
This looks for spectral signs that a star is wobbling due to gravitational tugs from an orbiting planet.
一颗不绕轨道运行的行星在一颗遥远的恒星前面经过时，就会因放大恒星的光而暴露自己。
As the planet passes in front of a distant star-one it isn't orbiting-it gives itself away by magnifying the star's light.
当行星绕太阳运行时，其轨道椭圆的主轴每次都会改变。
The main axis of the planet's orbital ellipse shifts each time when it goes around the sun.
多年来，牛顿一直对月球和行星绕轨道运行的原因感到好奇。
Newton for years had been curious about the cause of the orbital motion of the moon and planets.
最终会导致其中一个行星输掉这场较量，失去在这个星系中存在的资格，或者被完全开除出绕恒星运行的轨道。
Eventually, one planet loses the battle and winds up in the nether regions of its solar system or kicked out of the parent star's orbital nest entirely.
天文学家们认为这颗新发现的行星的质量至少是木星的1.25倍，它的运行轨道非常贴近其母星，绕其运行一周只需16.2天。
The new planet is thought to have a minimum mass 1.25 times that of Jupiter and circles in close proximity to its parent star, with an orbit lasting just 16.2 days.
这颗行星围绕着一颗名为“格里斯876”的恒星运转，该恒星距地球15光年，绕轨道运行一周的时间约为地球上的1.94天。
It is orbiting a star called Gliese 876, 15 light years from Earth, with an orbit time of just 1.94 Earth days.
行星绕太阳运行的轨道是近圆形的椭圆，太阳位于每个椭圆中心的附近。
Planets orbit the sun in oval-shaped paths called ellipses, and the sun is slightly off to the side of the center of each ellipse.
而且，我们可能需要等待一个很长的时间才能等到一个类地行星第二次围绕它的恒星作轨道运行：外星系的天文学家们要花两年的时间才能看到两次我们的地球绕太阳运行。
And we may have to wait a very long time for a planet like Earth to orbit its star twice: Alien astronomers would have to wait two years to observe our planet transiting the sun twice.
小行星是由岩石或是金属块构成的小天体，他们绕太阳运动但绝不会卷入其他行星的运行轨道中。
Asteroids are stray chunks of rocky or metallic materials that orbit the sun but were never drawn into any of the planets.
但多年来牛顿一直对月球和行星绕轨道运行的起因好奇不已。
But Newton for years had been curious about the cause of the orbital motion of the moon and planets.
绕小行星运行的航天器由于受到摄动力的影响，运行轨迹会偏离二体假设下的圆锥曲线轨道。
Due to the dragging force, trajectories of spacecraft circling planetoid can departure from the standard taper curve orbit which is obtained by the two-body hypothesis.
它们中的大多数在小行星带中绕太阳作轨道运行，小行星带位于火星轨道和木星轨道之间。
Most of them orbit the Sun in the asteroid belt, which lies between the orbits of Mars and Jupiter.
当一颗行星绕它的轨道运行时，它能来回牵引恒星。
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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