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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It flew with two astronauts instead of four, leaving two seats spare for Butch and Suni's return.，这一点在WPS下载最新地址中也有详细论述
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。关于这个话题，WPS下载最新地址提供了深入分析
"In other countries they might spend a lot of time at work, but that doesn't mean they work a lot. Changing the culture and the mindset is the biggest challenge."
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