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- The VISION survey covers approximately 18.3 square degrees at a scale of about one-third of an arcsecond per pixel.
- The other giant molecular cloud in the Orion Molecular Cloud is Orion B, which lies east of Orion’s Belt.
- The complete VISION survey includes an even larger region than is shown in this picture, which covers 39 578 x 23 069 pixels.
- The Orion nebula was first described in the early seventeenth century although the identity of the discoverer is uncertain. The French comet-hunter Messier made an accurate sketch of its main features in the mid-eighteenth century and gave it the number 42 in his famous catalogue. He also allocated the number 43 to the smaller detached region just north of the main part of the nebula. Later William Herschel speculated that the nebula might be “the chaotic material of future suns” and astronomers have since discovered that the mist is indeed gas glowing in the fierce ultraviolet light from young hot stars that have recently formed there.
- The successful VISION survey of Orion will be followed by a new, bigger public survey of other star-forming regions with VISTA, called VISIONS, which will start in April 2017.