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- Comet abstract "A comet is an icy small Solar System body that, when passing close to the Sun, heats up and begins to outgas, displaying a visible atmosphere or coma, and sometimes also a tail. These phenomena are due to the effects of solar radiation and the solar wind upon the nucleus of the comet. Comet nuclei range from a few hundred metres to tens of kilometres across and are composed of loose collections of ice, dust, and small rocky particles. The coma and tail are much larger, and if sufficiently bright may be seen from the Earth without the aid of a telescope. Comets have been observed and recorded since ancient times by many different cultures.Comets have a wide range of orbital periods, ranging from several years to several millions of years. Short-period comets originate in the Kuiper belt or its associated scattered disc, which lie beyond the orbit of Neptune. Longer-period comets are thought to originate in the Oort cloud, a spherical cloud of icy bodies extending from outside the Kuiper Belt to halfway to the next nearest star. Long-period comets are directed towards the Sun from the Oort cloud by gravitational perturbations caused by passing stars and the galactic tide. Hyperbolic comets may pass once through the inner Solar System before being flung out to interstellar space along hyperbolic trajectories.Comets are distinguished from asteroids by the presence of an extended, gravitationally unbound atmosphere surrounding their central nucleus. This atmosphere has parts termed the coma (the central atmosphere immediately surrounding the nucleus) and the tail (a typically linear section consisting of dust or gas blown out from the coma by the Sun's light pressure or outstreaming solar wind plasma). However, extinct comets that have passed close to the Sun many times have lost nearly all of their volatile ices and dust and may come to resemble small asteroids. Asteroids are thought to have a different origin from comets, having formed inside the orbit of Jupiter rather than in the outer Solar System. The discovery of main-belt comets and active centaurs has blurred the distinction between asteroids and comets.As of July 2013 there were 4,894 known comets, and this number is steadily increasing. However, this represents only a tiny fraction of the total potential comet population, as the reservoir of comet-like bodies in the outer Solar System may number one trillion. Roughly one comet per year is visible to the naked eye, though many of these are faint and unspectacular. Particularly bright examples are called "Great Comets".On 22 January 2014, ESA scientists reported the detection, for the first definitive time, of water vapor on the dwarf planet, Ceres, largest object in the asteroid belt. The detection was made by using the far-infrared abilities of the Herschel Space Observatory. The finding is unexpected because comets, not asteroids, are typically considered to "sprout jets and plumes". According to one of the scientists, "The lines are becoming more and more blurred between comets and asteroids."".
- Comet thumbnail HRIV_Impact.gif?width=300.
- Comet wikiPageExternalLink books?id=kC5oQgAACAAJ.
- Comet wikiPageExternalLink en.
- Comet wikiPageExternalLink solarsystem.nasa.gov.
- Comet wikiPageExternalLink profile.cfm?Object=Comets.
- Comet wikiPageExternalLink www.icq.eps.harvard.edu.
- Comet wikiPageExternalLink index.html.
- Comet wikiPageExternalLink nearearthobjectwatch.
- Comet wikiPageID "5962".
- Comet wikiPageRevisionID "606480308".
- Comet align "right".
- Comet b "Solar System".
- Comet caption "C/2011 W3 heads towards the Sun".
- Comet caption "Comet Holmes in 2007, showing blue ion tail on right".
- Comet caption "Nucleus of Comet 103P/Hartley as imaged during a spacecraft flyby. The nucleus is about 2 km in length.".
- Comet commons "Category:Comets".
- Comet direction "vertical".
- Comet hasPhotoCollection Comet.
- Comet image "17".
- Comet image "495296".
- Comet image "Lovejoy-hi1a srem dec12 14.gif".
- Comet n "no".
- Comet q "Comet".
- Comet s "no".
- Comet species "no".
- Comet v "Comets".
- Comet width "220".
- Comet wikt "comet".
- Comet subject Category:Comets.
- Comet comment "A comet is an icy small Solar System body that, when passing close to the Sun, heats up and begins to outgas, displaying a visible atmosphere or coma, and sometimes also a tail. These phenomena are due to the effects of solar radiation and the solar wind upon the nucleus of the comet. Comet nuclei range from a few hundred metres to tens of kilometres across and are composed of loose collections of ice, dust, and small rocky particles.".
- Comet label "Comet".
- Comet label "Cometa".
- Comet label "Cometa".
- Comet label "Cometa".
- Comet label "Comète".
- Comet label "Komeet".
- Comet label "Komet".
- Comet label "Kometa".
- Comet label "Комета".
- Comet label "مذنب".
- Comet label "彗星".
- Comet label "彗星".
- Comet sameAs Kometa.
- Comet sameAs Komet.
- Comet sameAs Κομήτης.
- Comet sameAs Cometa.
- Comet sameAs Kometa.
- Comet sameAs Comète.
- Comet sameAs Komet.
- Comet sameAs Cometa.
- Comet sameAs 彗星.
- Comet sameAs 혜성.
- Comet sameAs Komeet.
- Comet sameAs Kometa.
- Comet sameAs Cometa.
- Comet sameAs m.01srj.
- Comet sameAs Q3559.
- Comet sameAs Q3559.
- Comet wasDerivedFrom Comet?oldid=606480308.
- Comet depiction HRIV_Impact.gif.
- Comet isPrimaryTopicOf Comet.