10. Hubble Repair
Gravity opens with space shuttle astronauts repairing the Hubble Space Telescope when disaster strikes, prompting them to flee to the nearby International Space Station. In reality, Hubble and Space Station are 120 miles apart and out of range of the kinds of jetpacks worn by Clooney's character in the movie. Which is why the last real-life Hubble repair mission, in 2009, was initially deemed too dangerous to attempt. Had anything gone wrong, the astronauts would have had no refuge or hope of rescue. The mission went ahead anyway, with astronauts John Grunsfeld, Andrew Feustel, Michael Massimino, and Michael Good performed the repairs and upgrades over five space walks without a hitch.