The absence of an oxygen atmosphere on Mars and other planets in our solar system means that these planets also lack an ozone shield that would protect surface-dwelling life from UV radiation.
在火星和我们太阳系的其他行星上没有氧气，这意味着这些行星也缺乏保护地表生物免受紫外线辐射的臭氧层。
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。
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。
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。
In 1997, they saw evidence of planets near other stars like the sun.
1997年，他们发现了太阳等其他恒星附近有行星存在的证据。
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。
Other planets in our solar system lack the oxygen atmosphere that helps explain why life exists on Earth.
我们太阳系的其他行星缺乏氧气大气层，这有助于解释为什么地球上存在生命。
Earth is the only one of the inner planets with a large satellite, the orbit of which is neither in the equatorial plane of Earth nor in the plane in which the other planets lie.
地球是内行星中唯一一个有大卫星的，它的轨道既不在地球的赤道平面上，也不在其他行星所在的平面上。
Scientists have launched many spaceships to explore other planets in the solar system.
科学家们已经发射了很多宇宙飞船去探索太阳系的其他行星。
In the future, we might see cities on the moon or even new human cultures on other planets.
未来，我们可能会在月球上看到城市，甚至在其他行星上看到新的人类文化。
The team found that at some positions in the disk, planets would be pushed inward, and that at other positions, planets would be pushed outward.
这个研究小组发现在盘状物的某些位置上行星会被向内推，而在另外的一些位置上行星会被向外推。
Astronomers have been able to take the temperature of planets around other stars, first with telescopes in space but more recently with ground-based instruments, as my collaborators and I have done.
天文学家已能够对其他恒星周围的行星测量温度，起初用的是太空望远镜但近来用的是地面仪器设备，就像我的合作者与我所做的那样。
The idea was to take pictures of the night sky along what’s known as the ecliptic plane, the band in the sky where most of the other planets orbit, and see if anything moved.
这个想法是沿着所谓的黄道面拍摄夜空，这个地带是空中的这个范围中大部分其他的行星轨道，观察是否有东西移动。
It's one of the paradoxes I enjoy in my brain that I think in all probability there is life on other planets, while at the same time being more than happy to mock anyone who claims to have met it.
我一方面认为多半在其他星球上存在生命，另一方面更加乐于嘲笑那些声称碰到过外星生物的人，这是我脑中的矛盾想法之一。
The Keck Observatory has been invaluable in detecting extrasolar planets, worlds around other stars that were long postulated but only detected in the last dozen years or so.
近十几年来，人类开始探测到其他恒星周围的行星，在探测太阳系以外行星的过程中，凯克望远镜具有不可估量的的价值。
The new model, which tracks thousands of tiny particles beyond the orbit of Neptune, could help astronomers work out the properties of planets in other stars' dust disks.
这个新模型追踪了海王星轨道外数无数个微小物体的运行轨迹，它可以帮助天文学家计算出其他星系尘埃盘中行星的特性。
The spacecraft launched in 1977 and has taken photographs of Earth and other planets.
航天器自1977年启航，已拍摄地球及其它行星照片
The findings, detailed in this week's issue of the journal Nature, indicate there are about two free-floating planets per star in our galaxy—and perhaps in other galaxies, too.
发现表明，在我们的银河系中每一颗恒星大约会有两个不受约束的行星。大概其它星系也是如此。
They believe that God became incarnate in the form of Jesus Christ in order to save humankind, not dolphins or chimpanzees or little green men on other planets.
他们相信，上帝化身基督以拯救人类，而不是拯救海豚、黑猩猩或者是其它行星上的绿色小人儿。
The discovery of multicellular life in the deep subsurface of the Earth also has important implications for the search for subsurface life on other planets in our solar system.
地球深层多细胞生物的发现，对于在太阳系其它行星寻找地下生命也有重要的启示。
They don't wander the galaxy looking for tasty snacks in the form of planets and stars; they orbit the Milky Way just like the hundreds of billions of other stars do.
它们并未以行星和恒星的形式在星系中漫游，寻找可口的小吃，而是像数百亿其它恒星那样环绕银河系运行。
Other more complex issues regarding where the moon falls in relation to the planets, and within the zodiac, can also come in to play.
其它一些更为复杂的争议则围绕着月球与行星以及黄道带之间的关系而展开。即便是最明辨是非的美食家也会认为这不过是在赶时髦。
The planet, HR 8799e, is a gas giant rather like Jupiter, but about 10 times as massive — similar to the other three planets in the system, which Marois discovered in 2008.
这颗编号为HR 8799e的行星是一颗与木星相似的气态巨星，但其质量约是木星的10倍，这一点与该星系中由Marois于2008年发现的其它三颗行星相似。
In other words, the remoter planets are attracted by the sun with less force than those nearer to him.
换句话说，那些距离遥远的行星受到太阳的引力要比近处的行星较小。
Alien life, he will suggest, is almost certain to exist in many other parts of the universe: not just in planets, but perhaps in the centre of stars or even floating in interplanetary space.
他认为，外星生物，几乎肯定存在于宇宙的某个角落，不光是在行星上，还有可能存在于恒星的中心，甚至漂浮在星际空间。
Conventional theory used to suggest that the Sun and its family of planets formed in near isolation, far away from other stars.
传统的理论认为太阳和它的家族行星是孤立形成的，并且与其他星系相隔很远。
Pluto, Eris and the many other Kuiper Belt objects are far too different to be lumped in with the eight official planets, he said.
冥王星、厄里斯和许多其他柯伊伯带的天体对于八大行星来说太不同了，无法归为一类，他说。
UFO sightings have been reported throughout recorded history and in various parts of the world, raising questions about life on other planets and whether extraterrestrials have visited Earth.
在全世界各地不同时期都有ufo目击的报告，引起人们关于外星生命以及地外生命是否访问过地球的争论。
UFO sightings have been reported throughout recorded history and in various parts of the world, raising questions about life on other planets and whether extraterrestrials have visited Earth.
在全世界各地不同时期都有ufo目击的报告，引起人们关于外星生命以及地外生命是否访问过地球的争论。
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