Visible-light astronomy Visible-light astronomy Visible-light astronomy encompasses a wide variety of observations via telescopes that are sensitive in the range of visible light (optical telescopes). Visible-light astronomy is part of optical astronomy, and differs from astronomies based on invisible types of light in the electromagnetic radiation spectrum, such as radio waves, infrared waves, ultraviolet waves, X-ray waves and gamma-ray waves. Visible light ranges from 380 to 750 nanometers in wavelength. Visible-light astronomy has existed as long as people have been looking up at the night sky, although it has since improved in its observational capabilities since the invention of the telescope, which
Ultraviolet (Light My Way) as such: "I'd go in and say, 'The song has gone, whatever it is you liked about this song is not there anymore. Sometimes, for example, the song would have disappeared under layers of overdubs." "Ultraviolet (Light My Way)" is written in a 4/4 time signature. The lyrics of "Ultraviolet (Light My Way)" are addressed to a lover, and imply that their relationship is threatened by some sort of personal or spiritual crisis, coupled with a sense of unease over obligations. Indeed, lead vocalist Bono has called the song "a little disturbed". The song opens with 45 seconds of soft