The ISS does have its own defenses, of course. Fabric-y buffers envelope some of the systems, and a bumper called the Whipple Shield helps blunt impact. That shield is only built to stop debris up to about 1 cubic centimeter, though, and the debris tracker is only designed to catch pieces 10 cubic centimeters and larger. In other words, there’s a gap in defenses.
Step 2: Route on the Abstract Graph (The "Highway" Part):
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"That temperature is pretty nice here, really," he says. "Minus five is as warm as it gets. It can get down to about -40, but you're looking at about -20 being the average."，详情可参考爱思助手下载最新版本
联邦航空管理局的通知称因“特殊安全原因”实施限制，规定除医疗紧急情况和搜救行动外，所有飞行员均不得进入该空域。这些限制措施目前暂定持续到6月下旬。