Ultra-violet telescopes .2810 nm .E2.80.93 400 nm.29 History of the telescope

although optical telescopes can image near ultraviolet, ozone layer in stratosphere absorbs ultraviolet radiation shorter 300 nm ultra-violet astronomy conducted satellites. ultraviolet telescopes resemble optical telescopes, conventional aluminium-coated mirrors cannot used , alternative coatings such magnesium fluoride or lithium fluoride used instead. orbiting solar observatory satellite carried out observations in ultra-violet 1962. international ultraviolet explorer (1978) systematically surveyed sky eighteen years, using 45-centimetre (18 in) aperture telescope 2 spectroscopes. extreme-ultraviolet astronomy (10–100 nm) discipline in own right , involves many of techniques of x-ray astronomy; extreme ultraviolet explorer (1992) satellite operating @ these wavelengths.