This altered the propagation of GPS signals and slowed the rate of decay of space debris in low Earth orbit.

这样就改变了GPS信号的传播，减小了地球底层轨道上空间碎块的衰减速度。

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But this orbit will rapidly decay over the coming week as the spacecraft drags through the top of the atmosphere.

BBC: Video tracks stricken Mars probe

Iphone sales will slow next quarter and there after maintain a steady sale rate very much like a rocket which has reach an orbit until other forces slows it momentum and its orbit begins to decay.

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Dr Krag and colleagues at Esoc, like a number of teams around the world, are now busy modelling the decay in Phobo-Grunt's orbit.

BBC: Video tracks stricken Mars probe