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This unique spiral galaxy, which is situated 3.2 billion light-years from the Earth, has an extended stream of bright blue knots and diffuse wisps of young stars. [2] It rushes at 3.6 million km/h (1000km/s [2]) through the cluster Abell 2667 and therefore, like a comet, shows a tail, with a length of 600,000 light-years.
The original form was a box with what looks like the horns of Aries on top. [49] [51] [16] [55] [86] An early elaborate form is an altar surmounted with a censer holding the sacred fire. [49] [51] [51] U+26B6 (dec 9910) ⚶ The modern V-shaped form dates from astrological use in the 1970s; it is an abbreviation of the above. [49] [51] 5 Astraea ...
The word comet derives from the Old English cometa from the Latin comēta or comētēs. That, in turn, is a romanization of the Greek κομήτης 'wearing long hair', and the Oxford English Dictionary notes that the term (ἀστὴρ) κομήτης already meant 'long-haired star, comet' in Greek.
Stardust's discovery of crystalline silicates in the dust of comet Wild 2 implies that the dust formed above glass temperature (> 1000 K) in the inner disk region around a hot young star, and was radially mixed in the solar nebula from the inner regions a larger distance from the star or the dust particle condensed in the outflow of evolved red ...
As space objects go, comets and meteors are not very big. While a planet like Earth is about 8,000 miles in diameter and a star like our Sun is about 865,000 miles across, the largest asteroid ...
Even so, quite a few comets were lost because their orbits are also affected by non-gravitational effects such as the release of gas and other material that forms the comet's coma and tail. Unlike a long-period comet , the next perihelion passage of a numbered periodic comet can be predicted with a high degree of accuracy.
[181] [182] Rocky material represents asteroids and porous material represents comets. Cometary material is porous from nucleus size to micron sized fractal dust it emits. [183] [184] The collisional lifetime of a dust particle in interplanetary space can be determined where the flux of interplanetary dust is known.
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