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The pars plicata (also known as corona ciliaris [1]) (Latin: folded portion) is the folded and most anterior portion of the ciliary body of an eye. The ciliary body is a part of the uvea, one of the three layers that comprise the eye. The pars plicata is located anterior to the pars plana portion of the ciliary body, and posterior to the iris.
The cornea is the transparent front part of the eyeball which covers the iris, pupil, and anterior chamber. Along with the anterior chamber and lens, the cornea refracts light, accounting for approximately two-thirds of the eye's total optical power. [1] [2] In humans, the refractive power of the cornea is approximately 43 dioptres. [3]
Corona, people at a cantus (Dutch drinking and singing party) The Coronas, an Irish rock band "Corona" (song), by The Minutemen; Corona, by Japanese composer Toru Takemitsu; Corona, the circle of clergy or singers who surround the altar, and origin of the term choir; La corona, an opera; Corona Capital, music festival
The Sun's corona is much hotter (by a factor from 150 to 450) than the visible surface of the Sun: the corona's temperature is 1 to 3 million kelvin compared to the photosphere's average temperature – around 5 800 kelvin. The corona is far less dense than the photosphere, and produces about one-millionth as much visible light.
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They are arranged in a circle, and form a sort of frill behind the iris, around the margin of the lens.. They vary from sixty to eighty in number, lie side by side, and may be divided into large and small; the former are about 2.5 mm. in length, and the latter, consisting of about one-third of the entire number, are situated in spaces between them, but without regular arrangement.
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The outburst may remain visible to the naked eye for a couple of days before it begins to fade. Even after it dims, skywatchers will likely still be able to spot the eruption for around a week ...