The odds of this potential occurrence have been calculated by crack mathematicians (or were they mathematicians on crack?) at the Pop Culture Institute as being Not Bloody Likelyshitload*. Then again, math never was our strongest subject - obviously; William Ailor, director of The Aerospace Corporation's Centre for Orbital Re-entry Debris Studies, told the Associated Press at the time that the odds were 'slim to none'. Gee, for a smart guy that doesn't sound very scientific.
Still, as PR stunts go, it was pretty effective; even with a probability of 'Not Bloody Likely to the power of shitload' Taco Bell took out a pretty hefty insurance policy, just in case. After all, 280 million tacos costs a lot of money; not to mention what it would have done to the sales of Charmin. Had Mir hit the target, it would have gone down in the annals - not to mention the anals - of history.
Nevertheless, when Mir made it's run for the border of space it was the largest item in history to have been de-orbited; Skylab's mass was 77,088 kg compared to Mir's 124,340, and when it returned to Earth in July 1979 pieces of it rained down all over the town of Esperance, in Western Australia, the largest one the size of a washing machine. (The town fined NASA $400 for littering - a fine which has never been paid, I might add.) Had Mir struck land the possible fine could easily have bankrupted the Russian government, just as surely as it could have bankrupted Taco Bell's insurer had it struck the target.
*Kudos to regular commenter and Brain Trust member Sr. Mainar for providing some calculation of the possibility of Skylab hitting the target, which sounds pretty accurate to me; check it out in the comment section below.
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