当天文学家发现了这颗恒星，他们就会观察它周围的行星。
When astronomers have found the star, they look at the planets around it.
下一步天文学家试图找到这颗钻石行星是否有行星环。
The next step for astronomers is to find out if the diamond planet has rings.
为了研究系外行星，天文学家必须非常有创造性。
In order to study exoplanets, astronomers have had to be quite inventive.
天文学家早就认为，几大行星的轨道是可以预测的。
Astronomers had thought that the orbits of the planets were predictable.
天文学家们断定它是一颗岩石行星，并有着足够的引力，保证大气的存在。
Astronomers believe it is a rocky planet with enough gravity to retain an atmosphere.
然而，我们从天文学中知道了很多关于行星的事。
We do know a lot about the planets, however, from the science of astronomy.
1846年以前没有人在天文望远镜中真正看见这颗行星。
天文学家不再肯定冥王星应该被视为行星。
Astronomers are no longer sure that Pluto should be considered a planet.
相反，这次通过给了天文学家详细研究小行星的一个难得机会。
Instead, the pass gives astronomers a rare opportunity to study the asteroid in detail.
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。
The were stunned to find a rocky planet so near a star, he said.
大多数天文学家们现在认为这些人所见到的极有可能是金星这个行星。
Most astronomers now believe that what these people saw was almost certainly the planet Venus.
天文学家还没有目击过小行星撞击其它行星。
Astronomers have yet to witness an asteroid impact with another planet.
天文学家们认为这样一来，这颗行星就像彗星一样有了一条尾巴。
Astronomers think that it may then have a tail like a comet's.
也许天文学家们必须重新思考他们对于“行星”的定义。
Or maybe astronomers will have to rethink their definition of "planet."
也许天文学家们必须重新思考他们对于“行星”的定义。
Or maybe astronomers will have to rethink their definition of "planet."
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