But what if it’s not fine? Even back in 1996, before a single component of the ISS was launched into orbit, NASA foresaw the possibility of an even worse worst-case scenario: an uncontrolled reentry. The crux of this scenario involves multiple systems failing in an improbable but not completely impossible cascade. Cabin depressurization could damage the avionics. The electrical power system could go offline, along with thermal control and data handling. Without these, systems controlling coolant and even propellant could break down. Unmoored, the ISS would edge slowly toward Earth, maybe over a year or two, with no way to control where it is headed or where its debris might land. And no, we could not save ourselves by blowing the station up. This would be extremely dangerous and almost certainly create an enormous amount of space trash—which is how we got into this hypothetical mess in the first place.
从“十五五”规划建议提出“持续巩固拓展脱贫攻坚成果”，到2026年中央一号文件明确提出“实施常态化精准帮扶”，着眼的正是确保长久守住不发生规模性返贫致贫底线。
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Largest ever image obtained by specialist telescope in Chile represents scientific and aesthetic breakthrough