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The discovery of main-belt comets and active centaur minor planets has blurred the distinction between asteroids and comets. As of November 2014[update]
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all) comets are eventually depleted of their surface volatile ices and develop the appearance of asteroids. A further distinction is that cometstypically
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across. Asteroids are differentiated from cometsand meteoroids. In the case of comets, the difference is one of composition: while asteroids are mainly
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near-Earth asteroids and trojan asteroids. About half the mass of the belt is contained in the four largest asteroids: Ceres, Vesta, Pallas, and Hygiea.
71 KB (7,577 words) - 21:40, 20 April 2018
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Main-belt comets (MBCs) are bodies orbiting within the asteroid belt that have shown comet-like activity during part of their orbit. The Jet Propulsion
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composition of the comet, astronomers hoped to determine how comets form based on the differences between the interior and exterior makeup of the comet. Observations
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Asteroid laser ablation is a proposed method for deflecting asteroids, involving the use of a laser array to alter the orbit of an asteroid. Laser Ablation
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tails of active comets and from collisions betweenasteroids in the asteroid belt. Many of our meteor showers have no known active comet parent bodies.
14 KB (1,725 words) - 19:08, 4 April 2018
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Hilda or Hildian asteroids are a dynamical group of asteroids in a 3:2 orbital resonance with Jupiter. The namesake is the asteroid 153 Hilda. Hildas
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a very large asteroid in the inner asteroid belt. It is the largest of the stony (S-type) asteroids, andsomewhere between the 8th- and 12th-largest main-belt
15 KB (1,417 words) - 16:01, 30 January 2018
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of comets that would hold sway in Western thought for nearly two thousand years. He rejected the ideas of several earlier philosophers that comets were
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"Asteroid Impacts: The Extra Hazard Due To Tsunami". Science of Tsunami Hazards. 17 (3): 155–166. Steel, Duncan. Rogue Asteroids andDoomsday Comets:
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a few asteroids of this sort are known, locked into a 1:1 resonance with the Earth. The first was 3753 Cruithne, discovered in 1986. Asteroids that have
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classes of comet: short-period comets (also called ecliptic comets) and long-period comets(also called nearly isotropic comets). Ecliptic comets have relatively
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sungrazing comets, characterized by orbits taking them extremely close to the Sun at perihelion. They are believed to be fragments of one large comet that broke
24 KB (3,306 words) - 03:09, 24 January 2018
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carbonaceous outer-belt asteroids typically show a higher macroporosity than the basaltic, stony asteroids from the inner regions of the asteroidbelt. This minor
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October 2017. Asteroid Lightcurve Database (LCDB), query form (info) Dictionary of Minor Planet Names, Google books Asteroids andcomets rotation curves
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variable of time for all calculations pertaining to orbits of planets, asteroids, comets, andinterplanetary spacecraft in the Solar system. It is equivalent
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Skywatching Tips | Amateur Astronomy, Asteroids& Comets | Space.com Archived 5 October 2011 at WebCite "Question and answers 2". IAU. Archived from the
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Jupiter and Saturn, were also considered planets by some. The development of more powerful telescopes resulted in the discovery of the asteroids, the first
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