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
Out of Gas: The End of the Age of Oil a simple observation about natural resources. He described "Out of Gas: The End of the Age of Oil" in "The New York Times" as "a book that is more powerful for being brief -- takes a detour to explain some of the basics of energy budgets, thermodynamics and entropy, and it does so with the clarity and gentle touch of a master teacher". Raeburn concluded about Goodstein's book: "Publishers Weekly" commented on the book: Brian Braiker described the book in "Newsweek" as an "important one" where Goodstein gives the explanation of the science behind his prediction. Out of Gas: The