There might be a distant object in a more stable, more circular orbit that has gone unnoticed so far.

也许有这么一个遥远的天体具有一个更加稳定的更加圆润的轨道而至今未被我们发现。

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India's own lunar orbiter descended to about 60 miles in 2008, he said, but was forced to return to a more stable, 125-mile-high orbit.

他透露2008年印度的月球卫星曾下降到60英里处，但又被迫回到了更为稳定的125英里高的轨道上。

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Our computer simulations have shown that this type of orbit can be stable, but if you change things around just a little bit, it can become unstable very quickly.

我们做出的电脑模拟效果图显示，这一星系的运行轨道一般来说是稳定的，但是一旦其周围的物体发生变动，它就会瞬间变得不稳定。

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The Earth is just too unusual a place, they insisted, with its stable orbit, nearby moon, watery surface, plate tectonics and unique position in the galaxy.

FORBES: We've Got Company

The researchers used data from the global network of solar monitoring telescopes (Gong) as well as the Soho satellite positioned in a stable orbit 1.6 million km (a million miles) closer to the Sun than the Earth.

BBC: Sun has strange 'spin cycle'

"In a nutshell, the plan in NASA's hands calls for catching an asteroid with a robotic spacecraft and towing it back toward Earth, where it would then be placed in a stable orbit around the moon, " read a statement from the office of Florida Sen.

CNN: Forget falling stars: NASA plans to catch an asteroid