最近，行星科学家提出，地球生物圈发展的外部先决条件可能包括四个最重要的偶发事件。
Recently planetary scientists have suggested that the external preconditions for the development of Earth's biosphere probably included four paramount contingencies.
行星科学家艾伦·斯特恩认为，国际空间站最大的公关推动力可能来自私人资助的太空飞行业。
According to Alan Stern, planetary scientist, the biggest public relations boost for the ISS may come from the privately funded space flight industry.
由于大多数行星科学家认为水是生命的基本要素，因此黄钾铁矾的存在意味着火星上曾经存在出现生命的先决条件之一。
Since most planetary scientists believe that water is essential to life, the presence of jarosite means that one prerequisite for life was once present on Mars.
今天记者采访了行星科学家艾伦·斯特恩。
行星科学家推测这个风暴位于土星云层深处。
Planetary scientists hypothesize that the storm runs deep into Saturn's cloud tops.
新证据可能将会改变行星科学家们看待火星的态度。
The new evidence likely will change the way planetary scientists view Mars. Pourmand, who is an assistant professor in marine geology and geophysics, said
行星科学家长期以来也曾将金星的贫瘠归咎于缺乏一个内部磁场。
Planetary scientists have also long blamed Venus's sterility on the lack of an internal magnetic field.
约翰·格兰特(John Grant)是史密森尼学会的一名行星科学家。
John Grant is a planetary scientist with the Smithsonian Institution.
行星科学家们花了5年的时间，他们最终确信在火星上发现了甲烷。
It's taken 5 years, but planetary scientists are finally confident that they have detected methane on Mars.
行星科学家们现在怀疑是不是还有更多这样的“热点”分布在太阳系里。
The recent discovery of the geysers on Enceladus added a second twist, making planetary scientists wonder if there are even more such hot spots scattered around the solar system.
桑塔·克鲁兹加州大学的行星科学家，佛朗西斯•尼姆说，最不朽的碰撞使得月球完全摇摆不定。
These monumental blows can literally set moons rocking, said researcher Francis Nimmo, a planetary scientist at the University of California at Santa Cruz.
行星科学家们知道，水星密度极高——最可能的原因是相对于其它部分水星内核中铁含量非常巨大。
Mercury, planetary scientists knew, is uncommonly dense - most likely because its inner core of iron is very large relative to the rest of the planet.
一个困扰着行星科学家的问题是：海洋是怎样在像地球这样由硅酸盐和金属组成的石质行星的表面形成的？
One question that has baffled planetary scientists is how oceans formed on the surface of terrestrial planets like Earth — rocky planets made of silicate and metals.
行星科学家在七月宣称两颗来自星团航天器的备选尘埃粒子，在宇宙收集了7年尘埃样本后于2006年回到地面。
In July, planetary scientists announced two candidate dust particles from the Stardust spacecraft, which returned to Earth in 2006 after seven years of collecting dust samples in space.
行星科学家们可以通过计算一个特定元素有多少“母亲”放射性同位素衰变为“女儿”同位素来确定岩石的年龄。
Planetary scientists can determine a rock's age by calculating how many radioactive "parent" isotopes of a particular element have decayed into "daughter" isotopes.
最后，行星科学家急于了解土卫六的氮气及甲烷从何而来，又为什么只有它是太阳系唯一拥有浓密大气的卫星。
Finally, planetary scientists are eager to learn where Titan's nitrogen and methane originated and why it is the only moon in the solar system that possesses a dense atmosphere.
但最近进行的一项麻省理工学院的行星科学家的研究表明，星子(planetesimals)自己提供了形成海洋的水。
But a recent study by an MIT planetary scientist suggests that the planetesimals themselves provided the water that created oceans.
我们好奇的想知道在可能的居住世界，我们真的不得不找一个月球吗？ “，来自于爱达荷大学的行星科学家JasonBarnes告诉探索新闻。”
We were wondering 'Do we really have to find a moon or not?' around potentially habitable worlds, planetary scientist Jason Barnes, with the University of Idaho, told Discovery News.
十多年来行星科学家们已经发现了一些迹象，提示在那些太阳永远也照不到的寒冷月坑底部有结冰。而这些萦绕于心的种种迹象，让科学家们欲罢不能。
For more than a decade, planetary scientists have seen tantalizing hints of water ice at the bottom of these cold craters where the sun never shines.
那些观点已经很详细地发布在Icarus刊物上，主要是由国家航空航天局在加利佛尼亚Ames研究中心的一个行星科学家KevinZahnle和他的两个同事完成的。
Those views have now been given a particularly thoroughgoing expression in a paper in Icarus by Kevin Zahnle, a planetary scientist at NASA's Ames Research Centre, in California, and two colleagues.
“如果这个最大的未被发现的‘同伴’只有海王星那么大，或者更小，大部分行星科学家都不会感到惊喜，但是如果是木星那么大的暗星体，那将是一个惊喜，”马泰赛告诉SPACE.com太空网。
'Most planetary scientists would not be surprised if the largest undiscovered companion was Neptune-sized or smaller, but a Jupiter-mass object would be a surprise, ' Matese told SPACE.com
科学家仔细察看行星照片，寻找生命迹象。
Scientists are studying photographs of the planet for signs of life.
最后，科学家测量了由于行星的引力拖拉而产生的恒星摆动，这就是径向速度。
Finally, scientists measure the star's wobble due to the planet's gravitational tug, known as the radial velocity.
混沌理论是由科学家提出的，试图解释行星的运动和环境条件的变化。
Chaos theory was developed by scientists, trying to explain the movement of the planets and the changes in environmental conditions.
宇宙其他行星上存在生命的可能性一直激励着科学家探索外太空。
The possibility that there is life on other planets in the universe has always inspired scientists to explore the outer space.
宇宙其他行星上存在生命的可能性一直激励着科学家探索外太空。
The possibility that there is life on other planets in the universe has always inspired scientists to explore the outer space.
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