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.
One of the great things about decentralization is that it makes information harder to tamper with.
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宜昌人对蜡梅的喜爱，印在了年年岁岁的记忆里。作为传统的年宵花，春节前后，郊区农民剪下自家的蜡梅花枝进城出售，很快就会销售一空。捧着造型独特的蜡梅花枝回家，选个好看的花瓶插上，淡淡的清香弥散开来，新春的氛围一下子就浓了。
我们这里生成了多张国内城市的窗外照片，天气、风景和你所在的地方是一样吗。