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One reason for routinely launching GPS satellites is simply "constellation replenishment," said Col. Andrew Menschner, deputy commander of the Space Force's Space Systems Command. Old satellites degrade and die, and new ones need to go up and replace them. At least 24 GPS satellites are needed for global coverage, and having additional satellites in the fleet can improve navigation precision. Today, there are 31 GPS satellites in operational service, flying more than 12,000 miles (20,000 kilometers) above the Earth.
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Kevin Church,Science team
Россиянам с маленькими квартирами дали советMr.Doors: В маленькие квартиры лучше покупать мебель на заказ，详情可参考WPS下载最新地址
Дания захотела отказать в убежище украинцам призывного возраста09:44，推荐阅读服务器推荐获取更多信息
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