A lens with considerable coma may produce a sharp image in the center of the field, ⦠The comet's coma or head is the fuzzy haze that surrounds the comet's true nucleus. This aberration is called âcomaâ. NASA sent the Deep Impact spacecraft to crash into a comet and study what it is made of. Coma can occur even at short distances from the principal axis. In Chiron. Coma Definition Coma, from the Greek word "koma," meaning deep sleep, is a state of extreme unresponsiveness, in which an individual exhibits no voluntary movement or behavior. The best-known comet is called Halleyâs Comet. Coma is a state of prolonged unconsciousness that can be caused by a variety of problems â traumatic head injury, stroke, brain tumor, drug or alcohol intoxication, or even an underlying illness, such as diabetes or an infection. Coma, also known as âcomatic aberrationâ, is a type of optical aberration that results in off-axis points of light appearing comet-shaped. It can be seen from Earth about every 76 years. It is sometimes described as a âdirty snowball.â There are billions of comets in the solar system , but most never pass close by Earth. ), which means "hair" and is the origin of the word comet itself. As light rays from the edges of the frame pass through various parts of a spherical surface, they vary in magnification, creating a series of asymmetrical circular shapes of increasing sizes. Comet definition, a celestial body moving about the sun, usually in a highly eccentric orbit, consisting of a central mass surrounded by an envelope of dust and gas that may form a ⦠Coma is a medical emergency. coma or the comet's head. These phenomena are due to the effects of solar radiation and the solar wind upon the nucleus of the comet. Coma is an aberration which causes rays from an off-axis point of light in the object plane to create a trailing "comet-like" blur directed away from the optic axis (for positive coma). A comet is a small chunk of dust and ice that orbits, or travels around, the sun . A lens aberration, of course, is any imperfection in the way the lens focuses light. What we are talking about here is the photographic definition of coma which is: a spherical lens aberration in which the image of a point of light is rendered as a comet-shaped blur. Swift action is needed to preserve life and brain function. Add Definition. The coma is the nebulous envelope around the nucleus of a comet, formed when the comet passes close to the Sun on its highly elliptical orbit; as the comet warms, parts of it sublimate. A comet is an icy, small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process that is called outgassing.This produces a visible atmosphere or coma, and sometimes also a tail.These phenomena are due to the effects of solar radiation and the solar wind acting upon the nucleus of the comet. The shape of the coma can vary from comet to comet and for the same comet during its apparition. The coma (and tail) are really all that we see from Earth. The word âcomaâ, as well as the word âcometâ, comes from the Latin coma, meaning âhairâ, from a fanciful resemblance of a comet, or of a comatic image of a star, to the head of a girl with her long hair streaming out behind her. The coma is generally made of ice and comet dust.
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