What is asteroid belt?

  • (noun): The region of interplanetary space between Mars and Jupiter where most asteroids are found.

Asteroid Belt

The asteroid belt is the region of the Solar System located roughly between the orbits of the planets Mars and Jupiter. It is occupied by numerous irregularly shaped bodies called asteroids or minor planets. The asteroid belt is also termed the main asteroid belt or main belt to distinguish its members from other asteroids in the Solar System such as 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. These have mean diameters of more than 400 km, while Ceres, the asteroid belt's only dwarf planet, is about 950 km in diameter. The remaining bodies range down to the size of a dust particle. The asteroid material is so thinly distributed that numerous unmanned spacecraft have traversed it without incident. Nonetheless, collisions between large asteroids do occur, and these can form an asteroid family whose members have similar orbital characteristics and compositions. Nesvorny and Jenniskens (2010 Astrophysical Journal) attributed 85 percent of the Zodiacal Light dust to fragmentations of Jupiter-family comets, rather than from comets and collisions between asteroids in the asteroid belt. It was once thought that collisions of asteroids produce a fine dust that forms a major component of the zodiacal light. Individual asteroids within the asteroid belt are categorized by their spectra, with most falling into three basic groups: carbonaceous (C-type), silicate (S-type), and metal-rich (M-type).

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Some articles on asteroid belt:

E-type Asteroid
... E-type asteroids are asteroids thought to have enstatite (MgSiO3) achondrite surfaces ... They form a large proportion of asteroids inward of the asteroid belt known as Hungaria asteroids, but rapidly become very rare as the asteroid belt ... There are, however, some that are quite far from the inner edge of the asteroid belt, such as 64 Angelina ...
Nice Model - Solar System Features - Trojans and The Asteroid Belt
... scattered planetesimals of the primordial asteroid belt ... A large number of planetesimals would have also been captured in the outer asteroid belt, at distances greater than 2.6 AU, and in the region of the Hilda family ... that the Jupiter Trojans, Hildas and some of the outer asteroid belt, all spectral D-type asteroids, are the remnant planetesimals from this capture and erosion process ...
Asteroid Belt - Exploration
... The first spacecraft to traverse the asteroid belt was Pioneer 10, which entered the region on July 16, 1972 ... At the time there was some concern that the debris in the belt would pose a hazard to the spacecraft, but it has since been safely traversed by 11 Earth-based craft without incident ... Pioneer 11, Voyagers 1 and 2 and Ulysses passed through the belt without imaging any asteroids ...
Ceres In Fiction - Literature
... juvenile novel Lucky Starr and the Pirates of the Asteroids (1953) and the Wendell Urth mystery "The Dying Night" ... In Larry Niven's Known Space stories (1964 onward), the asteroid belt has a government based on Ceres ... interplanetary mystery involving the theft of asteroid-mined super-heavy metals ...
Physics And Star Wars - Specific Phenomena - Asteroid Field in Episode V
... Falcon is pursued by imperial ships through a dense asteroid field ... Ordinarily, an asteroid field or belt is unlikely to be so densely packed with large objects, because collisions reduce large objects to rubble ... About the only way for an asteroid belt to maintain itself would be to "balance destructive high-speed collisions with constructive soft collisions", but it is unclear ...

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