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.
Anthropic 的杀手锏，恰恰最难蒸馏
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他從不召開記者會，也不接受採訪——即便是面對受到嚴格控制的中國媒體。
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This story was originally featured on Fortune.com