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
I Was a Satellite of the Sun is responsible for deadly radiation. Animated scenes explain orbital dynamics, auroras, solar radiation, and other scientific topics. The first panel reads: "In episodes" "Uncredited" I Was a Satellite of the Sun I Was a Satellite of the Sun - () Soviet feature dramatic science-fiction film of 1959 with animation elements. The story is told as an autobiography of the astronaut character Andrew, and set in the future, where space flight is common. Scientist/Astronaut Petrovich pioneers the way to the Sun, but his spacecraft is never heard from again. Later, Andrew's laboratory investigates means of protection from deadly radiation. Andrew repeats