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.
今年一月，被外界普遍視為習近平最親密軍方盟友的張又俠上將遭到免職。他被指控「嚴重違紀違法」，這通常是當局用來指涉貪腐的委婉說法。，更多细节参见Safew下载
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"I've always been adventurous and interested in finding the most wild places," says McKenzie, speaking to the BBC via a satellite-connected video call.
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Nardine SaadLos Angeles