History of the telescope of the IRAS satellite in 1983 revolutionized infrared astronomy from space. This reflecting telescope which had a mirror, operated for nine months until its supply of coolant (liquid helium) ran out. It surveyed the entire sky detecting 245,000 infrared sources—more than 100 times the number previously known. Although optical telescopes can image the near ultraviolet, the ozone layer in the stratosphere absorbs ultraviolet radiation shorter than 300 nm so most ultra-violet astronomy is conducted with satellites. Ultraviolet telescopes resemble optical telescopes, but conventional aluminium-coated mirrors cannot be used and alternative coatings such as magnesium fluoride or lithium fluoride are used
Black Out the Sun (song) the Sun" is a perfect match for the atmospheric quality of the pop ballad. Standing on a deserted beach and surrounded by grim reapers, Hayes seems isolated, lost and confused. The dark and lifeless wasteland pictured in the video is the perfect backdrop for Hayes' state of mind in the song." Black Out the Sun (song) "Black Out the Sun" is the third overall single from British-based Australian singer-songwriter Darren Hayes' fourth studio album, "Secret Codes and Battleships", released on 2 October 2011. The song debuted at #101 on the UK Singles Chart. The song received its first radio airplay