Kenneth Larson writes, “The recent spate of news in UFO magazines and UFO blogs concerns the various witnesses around the world who aim a regular camera at the clear sky and see nothing but sky.”  But when they use a digital camera that has the infrared spectrum and take a photo of the clear sky and scan the digital camera image they discover or see an unexpected UFO.  Human eyes do not have the infrared spectrum---but many digital cameras do.  In turn, the UFOs seem to operate in the infrared spectrum.  So, UFOs do exist in the sky, but often we cannot see them with our regular eyesight.  Infrared is situated outside the visible spectrum at the red end--or the wavelength between 700 nanometers and 12 millimeter) spectrum. 
Editor’s Note: It appears that the heat from the cylinder shaped UFO in Addison, Texas is being captured by the digital camera, while the actual UFO is above it.

Thermal imaging cameras capture high definition temperature profiles of objects at distances from a few inches to hundreds of feet. The thermal images rapidly identify defects in electronics and power grids, heat leaks in windows and doors, water leaks and mold problems, and hot spots in machinery. You can make an infrared Filter for most digital cameras. Check to see if your camera is sensitive to infrared light by turning your camera on and pointing it at a TV remote controller. Press the remote controller channel changer and you should see a blinking light in your camera. If you can see a blinking light, all is good. Your camera can pick up infrared signals. Follow the instructions using a dark filter from blackened 35mm film.