These are only 18 feet on a side and designed to increase atmospheric drag and thus help satellites out of orbit.

这是一个只有18英尺的小型太阳帆，旨在增加大气阻力以帮助卫星脱离轨道。

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The orbital errors due to the potential coefficient model and atmospheric drag for the gradiometry satellite are obtained;

求出位系数模型和大气阻力引起的重力梯度卫星的轨道误差；

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The result is the five metre long aerodynamic satellite equipped with low power ion thrusters to compensate for atmospheric drag.

其结果是，5米长的空气动力卫星配备了低功耗的离子推进器，以补偿大气阻力。

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The moon will have gone (atmospheric drag will cause it to crash into the earth).

ECONOMIST: To the ends of the earth

Ballistic missiles are guided during powered flight and then release their payloads, which are then subject only to gravity and atmospheric drag.

CENTERFORSECURITYPOLICY: US Nuclear Stockpile

Once the Roton has been slowed sufficiently by atmospheric drag, however, the pilot will change the blade-angles so that the blades are set spinning by the airflow, slowing the craft still further. (This technique, called auto-rotation, is used by helicopter pilots in emergency landings.) Small thrusters on the side of the Roton will stabilise it, so that it can be steered towards its landing site.

ECONOMIST: On a rotor-blade and a prayer | The