Viking Orion is only the second cruise ship in the world to have a planetarium; the other is the Queen Mary 2, an ocean liner of the Cunard Cruise Line. Although Viking Orion is not the first cruise ship to offer a planetarium, the company says this one is the most advanced, with a Digistar 6 display system, five projectors and studio speakers. The addition of the Explorers' Dome on Viking Orion is viewed as a piece of "art," according to Viking. Joined by a NASA photo exhibit, the artwork on board pays tribute to the spirit of exploration. "And,...