Project Mercury was America's attempt to place a man in orbit around the Earth. Jim Lovell was one of the 110 test pilots considered for selection but a temporary liver condition put paid to his chances.
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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.。业内人士推荐搜狗输入法2026作为进阶阅读