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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12月22日，重庆渝北，一则男子爬树解救被困小猫的视频引发关注。视频中，男子小心翼翼地爬上树，将小猫带到安全高度后，才将它递给地面等待的主人。视频拍摄者周女士介绍，这只小猫前一天晚上受到惊吓，蹿到了树顶。一位大哥看到这一情况后，才爬上去施救，猫主人对此非常感激。SourcePh" style="display:none"