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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Цены на нефть взлетели до максимума за полгода17:55
我买东西，有选择困难症。看中的东西，不能马上下单，跟冬截然相反。这个事我反复想过，也属于早期创伤。生病后，我的选择困难症明显减轻了。扁鹊说，不治有病，治未病。这句话听着别扭，未病你治啥？其实他的意思是，病就是个标签。打个喷嚏流个鼻涕就大惊小怪，那根本不叫病。天下本没有病，说的人多了，就真有了病。我不爱吃药，裹着蜜的大药丸子偶尔吃几个，不为治病，为好吃。