The Apollo 15 mission of 1971, NASA’s fourth trip to the lunar surface, didn’t have the same cultural heft as Apollo 11 or the Hollywood-ready story arc of Apollo 13. Apollo 15, however ...

In 1971, NASA’s Mariner 9 spacecraft arrived at Mars only to find the planet’s surface entirely obscured from view, hiding beneath a blanket of dust that had been kicked up by a massive storm.