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 (album) the love that the band has for music and themselves. With over 16 years together and 9 recorded albums to their name, Sevendust has completed their musical journey to the top with "Black Out the Sun"." The album debuted at No. 18 on the "Billboard" 200, and No. 5 on the Top Rock Albums chart, selling around 27,000 copies in its first week of release. Sevendust Production and design Black Out the Sun (album) Black Out the Sun is the ninth studio album by American metal band Sevendust released on March 26, 2013. "Black Out the Sun" marks the band's