Debris actually pelts the ISS all the time, and noticeable dents and cracks line the exteriors. But should something fully breach the station, cabin atmosphere will seep into the vacuum of space and alarms will go off. Pressure gauges will confirm to astronauts that the station has, almost certainly, been hit, and the speed of the seepages may indicate how much time the crew has to respond. According to one NASA estimate, a 0.6-centimeter-wide hole leaves 14 hours to plug the leak. A 20-centimeter hole leaves less than a minute.
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The nuclear reactors that could power bases on the Moon
中国载人航天办公室官方宣布，2026年，计划实施2次载人飞行任务、1次货运飞船补给任务。今年的载人航天有两大亮点，一是来自港澳地区的航天员，有望最早于今年执行空间站飞行任务。