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.
未经设区的市级以上网信部门、公安机关批准或者行业主管部门、运营者授权，任何个人、组织不得对网络安全等级保护第二级（含）以下的网络开展网络安全漏洞探测、渗透性测试等可能影响网络安全的活动。
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Before you share your location, you'll get to choose how long you want to share -- one hour, today only (ending at midnight), until you turn it off, or for a custom time period less than 24 hours. You can also stop sharing at any time.
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