It is orbiting a star called Gliese 876, 15 light years from Earth, with an orbit time of just 1.94 Earth days.

这颗行星围绕着一颗名为“格里斯876”的恒星运转，该恒星距地球15光年，绕轨道运行一周的时间约为地球上的1.94天。

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They found that the shuttle's orbit time could be extended by 25 days, and reckoned that, with a second shuttle on stand-by in case crew needed rescuing, the risk was acceptable.

他们发现太空飞梭的轨道时间可以延长25天，并且一致认为：如果在第二个太空飞梭能够辅助于左右，以防宇航员需要救助，那么这一任务的危险性还是可以接受的。

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The shape of this orbit isn't consistent; it varies over time, over a period of about a thousand years.

轨道的形状并不是始终如一的；它会随时间变化，变化周期为一百年左右。

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And they broadcast, for the first time, live television pictures of men in orbit.

VOA: special.2009.07.08

n So the velocity is given by this product of the quantum number n Planck constant 2 pi mass of the electron time the radius of the orbit, which itself is a function of n.

速度是量子数,普朗克常数2π乘以轨道半径的值,它自身也是n的函数。

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As a result, the project's motto is "any orbit, any time, " and a big selling point is that the carrier aircraft can relocate more than 1, 300 miles without refueling to search for a suitable launch location.

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The watch was used to time the duration of the Descent Orbit Insertion maneuver and to time the rendezvous maneuvers after launch from the lunar surface.

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Whereas the orbiter could carry seven people at a time into orbit, the Russian Soyuz capsules being used at the moment will only ferry three individuals per flight.

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