Weir knocked this one out just before the 2015 movie adaptation of his novel The Martian. It's a 5 minute read, so hop to it.
Speaking of Mars, I would be remiss not to note today's passing of the rover Opportunity. It was supposed to last 90 days, and ended up doing heavy exploration of the Martian surface for 15 years. Few endeavors excel to that degree.
Here, have the obligatory xkcd:
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