英國首名嬰兒透過已故捐贈者子宮移植誕生

· · 来源:dev资讯

手机的创新速度,随着手机形态的挖掘和现有科技的限制,大大降低,这个社会与行业的共识已经基本形成。在现有的产品形态下,指望智能手机还能像早期那样,掏出接踵而至的大创新,几乎是不切实际的幻想。

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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.

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