SpaceX founder and CEO Elon Musk is a big "Hitchhiker's Guide" fan, as Starman's Roadster shows. The car's entertainment display was programmed to read "Don't Panic!" — the phrase that adorns the cover of the eponymous electronic guidebook in Adams' beloved series. Musk has said that he launched the Roadster and Starman because the duo is a lot more fun than the typical inert-mass dummy payload... Launching a satellite or other valuable spacecraft wasn't an option, given the risks inherent in maiden flights. The Roadster and Starman will come within a few hundred thousand kilometers of our planet in 2091,...