More than 80 million Americans believe that UFOs exist and many of them are not afraid of an alien drop-in, according to a new study. As part of its new Chasing UFOs" series, the National Geographic Channel conducted a poll to assess Americans' views on the paranormal. The study found that 11 percent of those polled believed they had seen a UFO. In addition, most of those polled said they would regard a minor alien invasion as only a minor inconvenience. And most expect the visitors to be "E.T."-type friendly. And despite the recent uproar over the Miami face-chewing incident, 71 percent in this survey were more likely to believe in aliens than in zombies, or vampires, or superheroes. The study threw in a few fun questions. Among them: Which superhero would Americans be more likely call on to battle aliens (the evil kind, not E.T.)? That would be the Hulk (21 percent). Spider-Man got only 8 percent of the vote. President Obama had the questionable honor of being perceived as better able to handle an alien invasion than GOP presidential candidate Mitt Romney; this was a notion held more strongly among women than men and among younger folks than older. The "Aliens Among Us" survey was conducted with a random nationwide sample of 1,114 Americans from May 21 to 29.