The asteroid belt, located between the orbits of Mars and Jupiter is about 180 million kilometers (111 million miles) wide. It varies between 387 million km and 489 million km from the Sun.
http://wiki.answers.com/Q/How_big_is_the_asteroid_belt
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Asteroid belt - Wikipedia, the free encyclopedia
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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...
en.wikipedia.org/wiki/Asteroid_belt
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The asteroid belt is divided into an inner belt and an outer belt. The inner belt which is made up of asteroids that are within 250 million miles of the Sun contains asteroids that are made of metals. ... 26 very large asteroids have been discovered, which is probably most of the big ones. But there are still millions...
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www.kidsastronomy.com/asteroid.htm
www.kidsastronomy.com/asteroid.htm
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The largest asteroid that has been found is the asteroid belt is as big as Texas. It has been given the name of Ceres. An asteroid is a chunk of rock in space. It is what was leftover when the Sun and planets formed.
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www.tqnyc.org/2006/NYC063368/the_asteriod_belt.htm
www.tqnyc.org/2006/NYC063368/the_asteriod_belt.htm
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On some asteroids, internal heat may also have formed metamorphosized rocks, and volcanoes may even have erupted. Although no asteroid in the Main Belt grew big enough to hold on to an atmosphere, minerals found in some meteorites suggest that liquid water was often present.
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www.solstation.com/stars/asteroid.htm
www.solstation.com/stars/asteroid.htm
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This area is sometimes called the "asteroid belt". Think about it this way: the asteroid belt is a big highway in a circle around the Sun. Think about the asteroids as cars on the highway. Sometimes, the asteroid cars run into one another.
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starchild.gsfc.nasa.gov/docs/StarChild/solar_system_lev...
starchild.gsfc.nasa.gov/docs/StarChild/solar_system_level1/asteroids.html
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Instead, they favor the theory that the observed dust is actually the result of asteroids banging together in a massive asteroid belt. ... ; PIA07852: Super-Comet or Big Asteroid Belt?; ... Super-Comet or Big Asteroid Belt?
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photojournal.jpl.nasa.gov/catalog/PIA07852
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Super-Comet or Big Asteroid Belt? ... The bumps and dips seen in these data, or spectra, represent the "fingerprints" of various minerals. Spectra are created when an instrument called ... Instead, they favor the theory that the observed dust is actually the result of asteroids banging together in a massive asteroid belt.
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www.spitzer.caltech.edu/Media/050420telecon/ssc2005-10a...
www.spitzer.caltech.edu/Media/050420telecon/ssc2005-10a.shtml
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A chance encounter between two huge chunks of rock in the asteroid belt reached out across 100 million years and 200 million kilometers to snuff out 90% of Earth's marine species, as well as the dinosaurs, 65 million years ago, according to a new analysis...
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www.sciencemag.org/cgi/content/short/317/5843/1310
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