Complex life evolved on the Earth's surface, but not on Mars or other planets in the solar system because on those planets, early surface life was killed by UV radiation.

复杂的生命在地球表面进化，而不是在火星或太阳系的其他行星上，因为在那些行星上，早期的地表生命被紫外线杀死了。

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But such transits have paved the way for what might prove to be one of the most vital breakthroughs in the cosmos—detecting Earth-sized planets orbiting other stars.

但是这样的凌日现象已经为被证明可能是宇宙中最重要的突破之一的说法铺平了道路，这个说法即找到那些围绕其他恒星轨道公转的和地球大小相似的行星。

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The nearly circular orbits of planets in our solar system led scientists to expect that planets around other stars would also reside in circular orbits.

在我们的太阳系中，行星的轨道几乎是圆形的，这使得科学家们预测，其他恒星周围的行星也会位于圆形轨道上。

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And what does that mean? It means I am trained in geology, but with interests in the other planets and Mars in particular."

VOA: special.2010.07.28

We will also tell about a historic record of rainy seasons in Asia, and the search for life on other planets.

VOA: special.2010.05.25

In turn, that should help resolve questions about how the Moon, the Earth, and other planets in the solar system evolved in the first place.

FORBES: NASA's GRAIL Mission Will Unlock Secrets Of The Moon's Interior

While putting money into renewed human space flight efforts, the proposal cuts scientific research, particularly the study of the other planets in our solar system.

CNN: NASA shoots for asteroid, new manned missions

America put a man in space, put a man in orbit, put a man on the moon, created the world's first reusable spacecraft, sent unmanned probes to other planets and led the world in making important scientific discoveries outside the Earth's atmosphere.

FORBES: NASA Needs A Mission