How do satellites stay up without falling down?

卫星是如何不坠落的呢？

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Others dream of using them as the basis of a novel communication system that would allow messages to be transmitted to the other side of the world without wires, cables or satellites.

另外一些科学家则梦想使用中微子作为一种新形通信系统的基础，使邮件可以传递到世界另一端，无需使用电线、电缆或卫星。

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This ensures that programs used on the satellites and in the ground station computers execute required missions without errors that commonly occur when incompatible technologies are combined.

这确保了用于卫星和地面站计算机中的程序执行要求的任务而不会产生错误，这些错误通常产生于不兼容的技术被共同使用的时候。

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Such detailed, small-scale measurements of a three-dimensional region of space would be impossible without satellites flying in formation.

ECONOMIST: Birds of a feather

Thus, private forecasters can stock up on free American data and resell it to other markets without investing in costly satellites or supercomputers.

ECONOMIST: Weather

Unlike conventional rockets that blast off from a pad, air-launched systems similar to the one Mr. Allen wants to put together are designed to deliver a broad range of satellites to space without the constraints of weather or optimal times and locations to try to reach specific orbits.

WSJ: Microsoft Co-Founder to Build Massive Jet for Space Launches