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
Harmful influence of technology different character than they are in the real life, what is not that easy to do in real communication or even the voice call. Harmful influence of technology Harmful influence of technology refers to the negative effect of technology which comes along with all of the useful implementations of variety of devices and innovations. People are constantly exposed to waves and radiation emitted from various appliances that are in everyday use. The rapid increase of the number of users of the mobile phones started in the last twenty years of the 20th century, and now multi-functionality of smartphones attract more