Space fans have been waiting for the movie “Interstellar” which opens in theaters this Friday, November 7. Today, the cast and crew of Interstellar did a special Google+ Hangout on Air at the Smithsonian’s National Air and Space Museum. Host Kevin Frazier and the cast had their chance to throw a few space-related questions to the astronauts and scientists assembled for the Hangout. Our own publisher, Fraser Cain, was the unfortunate target for the question, “can you explain what a black hole is?” You can watch the entire Hangout above; Fraser schools them at about 35:33.