The Space Shuttle prototype Enterprise, 1977. From The Atlantic's The History of the Space Shuttle.

A little heads up for those of you who didn't know: STS-135, the last ever shuttle mission, launches at 15:26 GMT this Friday. Given how exciting it was to watch the launch of STS-134 online a couple of months ago – one of those rare communal twitter experiences where it seemed everyone was looking at the same thing at the same time – I'm just a little bit goose-bumpy about this.

Be there or don't.