I remember the first time I remembered a smell. This was remembering to the extent that it stopped me in my tracks, taking me back to a specific moment, a specific place and a specific feeling. The smell was that of a bike shop. Mainly rubber, with notes of oil and plastic and a strong hint of sheer excitement. In that instant I was about 10 years old, in Bache Brothers Cycles at Lye Cross, near Stourbridge, in the West Midlands. My grandad was next to me, with the shop man. I was getting a bike for my birthday.
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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