Built in 1962 for the Seattle World’s Fair, the Pacific Science Center’s Laser Dome—or the Spacearium, as it was known at the time—is the world's oldest operating laser dome. Standing at 105 feet long and 100 feet wide, it is also the world’s largest. Its recent upgrade to a new laser system with nine Rainbow FX laser projectors, which helps create a more vivid and full experience, also makes it the Laser Dome with the greatest number of permanently installed full-color lasers in America.
The Laser Dome’s mesmerizing laser shows are created by the beams of photons shot out by specially made laser diodes. Prior to the laser upgrade, the PacSci had used gas lasers, which produced beams of bright light with carbon dioxide and compounds of noble gases that were regulated by electrical currents. However, the PacSci’s current lasers operate in a manner similar to that of an LED light, but at a far higher intensity. The Pacific Science Center’s Laser Dome, photo courtesy of Pacific Science Center.