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
The Sun Is Often Out It was, however, the next single, "On and On” which would be the band’s breakthrough single; reaching No. 16 in the UK. With this momentum the album was released in April and shortly after "She Said" was re-released, also making it to No. 16 in the UK singles chart. The final single from the album "Lost Myself", narrowly missed out on giving the band a third successive Top 20 single, stalling at No. 22. "The Sun Is Often Out" was declared one of 1996's 50 best albums by both "Q" and "Melody Maker" and retains a favourable 4 star rating