Our galaxy is so huge that dozens of lesser galaxies scamper about it, like moons orbiting a giant planet.
我们的银河系实在庞大，吸引着数十个较小的星系环绕着它奔跑，恰似环绕巨大行星旋转的卫星。
Likewise, when in outer space, when you are orbiting the Earth, people are always floating around in these space stations.
同样，在外太空中，当您绕地球运行时，人们总是在这些空间站中四处漂浮。
Denverites often kvetch about sleep disrupted by the Denver Police Department's helicopter orbiting overhead.
丹佛人经常抱怨他们睡觉的时候会受到头顶上方盘旋的丹佛警察局的直升飞机的干扰。
She is orbiting the sun as the asteroid 216 Kleopatra.
编号为216Kleopatra的小行星正绕着太阳运行。
We have an orbiting electron but a stationary nucleus.
我们有一个在轨运行的电子和一个静止原子核。
Around 60 countries now have satellites orbiting the Earth.
现在有60个国家有卫星在地球轨道上。
Astronomers name planets found orbiting stars with a letter.
天文学家通过添加一个字母来为其周围的行星命名。
This would hinder operations of low-Earth orbiting, or LEO, satellites.
这将阻碍低轨道地球卫星（LEO）的运转。
The debris is a collision threat to operational spacecraft orbiting Earth.
这些碎片对于环地球轨道的航天器操作来说是一个潜在的威胁。
Just as most orbiting planets spin on their axes, so asteroids also rotate.
正如其它沿轨道运行的行星自转一样，这些小行星也有自转。
Like the solar system, the planets orbiting Gliese 581 have mostly circular orbits.
和太阳系一样，围绕着Gliese 581运行的行星轨道大部分都是圆形的。
In 2005, astronomers presented evidence for the first planet orbiting a binarysystem.
2005年，天文学家公布了一颗行星绕双星系统运行的证据。 发现这样的证据在历史上还是第一次。
This planet is orbiting a star in the Pegasus constellation some 50 light years away.
这颗行星围绕着一颗距我们约五十光年的人马座恒星运转。
Astronomers have detected more than 400 planets orbiting stars beyond our solar system.
天文学家已经探测到太阳系外超过四百颗环绕恒星运行的行星。
Thales Alenia is building the next set of 66 Iridium low-Earth orbiting (LEO) satellites.
泰雷兹阿莱尼亚公司正在建造66颗下一代低轨道(LEO)铱星。
They left the orbiting laboratory about 98 percent complete after 11 years of construction.
经过十一年的建造，轨道实验室已完成了百分之九十八。
Still, we persevered and we eventually were able to spot the planets orbiting each massive star.
尽管如此，经过我们的坚持不懈，我们最终能发现每颗大质量恒星的行星。
The space station will be orbiting Earth for at least another five years, but probably much longer.
空间站将会至少再围绕地球转上5年，而且可能会更久。
Two of these sets of observations were made from the Earth, one from an ESA spacecraft orbiting Mars.
其中两组的观测来自于地球，一组来自于火星轨道的ESA航天器。
Both groups searched for the gamma-ray glow from dark matter in dwarf galaxies orbiting the Milky Way.
两组研究了环绕银河系的矮星系中的暗物质放射的伽马射线。
By looking for changes in this pulsing of the star, Dr Silvotti deduced that a planet was orbiting it.
通过对该恒星脉冲调制的观察，西尔·沃蒂博士推断此恒星周围有一颗围绕其运转的行星。
The photo was released Wednesday (April 20) to mark the orbiting observatory's upcoming 21st birthday.
这张照片是在周三（4月20日）公布的，目的是为这个轨道天文台即将到来的21岁生日庆生。
But how realistic is it to have a stable planet orbiting one (or both) of the stars in a binary system?
但是在双星系中，行星可以如此稳定同时绕双星或单星运行，这究竟现实与否？
It’s looking for the faint dimming of a star that occurs when an orbiting planet passes in front of it.
当绕着恒星运行的行星在恒星前方经过时，会在恒星表面留下微弱的阴影。开普勒正是寻找这样的阴影。
At any given time, there are several GPS satellites orbiting overhead at a distance of about 11, 000 miles.
在任何时间，总有若干颗全球定位系统的卫星在11000英里的高空围绕地球运行。
The team also said they found a planet 7.5 times the mass of Earth orbiting the star HD 181433 in 9.5 days.
该小组还说他们发现了一颗质量是地球的7.5倍的行星，以9.5天为一个公转周期，绕着HD 181433号恒星转动。
Lead researcher Pieter van Dokkum says there could be trillions of Earths orbiting the ubiquitous red dwarfs.
首席科学家皮特·范·多克姆表示，宇宙中可能有数以万亿计如地球这样的行星绕着广泛存在的红矮星。
Lead researcher Pieter van Dokkum says there could be trillions of Earths orbiting the ubiquitous red dwarfs.
首席科学家皮特·范·多克姆表示，宇宙中可能有数以万亿计如地球这样的行星绕着广泛存在的红矮星。
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