Huge solar mirrors are put in orbit round Mars to heat the polar ice caps.

巨大的太阳反射镜被射入火星的轨道来给两级冰冠热量。

) For example, the movement of the earth in its orbit round the sun produces gravitational waves.

) 例如，地球绕太阳公转的运动会产生引力波。

Even a telescope in orbit round the earth, like the very successful Hubble telescope, would not be suitable because of the dust particles in our solar system.

即使是一台放置在围绕地球的轨道上的望远镜--如非常成功的哈勃望远镜--也因为太阳系中的尘埃微粒而无法胜任。

On a smaller scale, the electrical forces that cause the electrons to orbit round the nucleus in an atom would behave in the same way as gravitational forces.

在较小的尺度上，导致电子围绕原子核运行的电力的行为方式与引力相同。

Alternatively, if the star were small, the life-supporting planet would have to have a close orbit round it and also provide the perfect conditions for life forms to develop.

或者，如果恒星很小，那么支持生命的行星就必须有一个靠近它的轨道， 并为生命形式的发展提供完美的条件。