Ten Foot Long Solar Balloon-- Just Add Sun! Fill this 10-foot x 2-foot black polyethylene solar balloon with regular air (found in any park), wait a few minutes and the sun (assuming there is sun), will heat that trapped air and make this thing rise like a UFO. We know it's authentic because it says "UFO SOLAR" right on the side. Funny they couldn't "identify" this flying object, considering they made it themselves. Includes a couple hundred feet of nylon tether so it can't escape to its home planet, wherever that may be.