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。
2
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。
3
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.