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Topic: Asteroid belt

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	Main Asteroid Belt
		While most asteroids may be only the size of pebbles, 16 asteroids have a diameter of 240 km (150 miles) and Ceres, the largest, has a diameter of about about 914 km (568 miles).
		Indeed, if all asteroids down to the size of meter- or yard-sized boulders or less were combined together, the resulting object would measure less than 1,300 to 1,500 km (810 to 930 miles) across, which is less than one third to one half the diameter of the Earth's Moon.
		Asteroids located closer to Mars and Earth that exhibit the same spectra are composed of rocky minerals ("stone") mixed with iron.
	www.solstation.com /stars/asteroid.htm (1425 words)

	ScienceDaily: Asteroid belt (Site not responding. Last check: 2007-11-07)
		The asteroid belt is a region of the solar system falling roughly between the planets Mars and Jupiter where the greatest concentration of asteroid orbits can be found.
		The total mass of the Asteroid belt is estimated to be 3.0 to 3.6×1021 kilograms, which is 4 percent of the Earth's Moon.
		Asteroid belt -- The asteroid belt is a region of the solar system falling roughly between the planets Mars and Jupiter where the greatest concentration of asteroid orbits can be found.
	www.sciencedaily.com /encyclopedia/Asteroid_belt (1733 words)

	Asteroid - MSN Encarta
		Asteroid, one of the many small or minor rocky planetoids that are members of the solar system and that move in elliptical orbits primarily between the orbits of Mars and Jupiter.
		Asteroids that intersect the orbit of Mars are called Amors; asteroids that intersect the orbit of Earth are known as Apollos; and asteroids that have orbits smaller than Earth’s orbit are called Atens.
		Three-quarters of the asteroids visible from Earth, as well as the dwarf planet 1 Ceres, belong to the C type, which appear to be related to a class of stony meteorites known as carbonaceous chondrites.
	encarta.msn.com /encyclopedia_761551567/Asteroid.html (2066 words)

	Asteroids
		Galileo flybys of asteroids Gaspra and Ida (and Ida satellite Dactyl).
		Asteroids are classified into a number of types according to their spectra (and hence their chemical composition) and albedo:
		Between the main concentrations of asteroids in the Main Belt are relatively empty regions known as the Kirkwood gaps.
	www.seds.org /nineplanets/nineplanets/asteroids.html (1354 words)

	Asteroid Facts - Explore the Cosmos \| The Planetary Society
		C-type asteroids are most commonly found in the outer regions of the main asteroid belt.
		Main Belt: Most minor planets orbit the Sun in the main asteroid belt, a vast ring of hundreds of thousands of rocky objects circling between the orbits of Mars and Jupiter, from 2 to 4 AU from the Sun.
		Many main belt asteroids may in fact contain a lot of ice, especially in the outer part of the belt; the line separating asteroids and comets is growing increasingly fuzzy.
	www.planetary.org /explore/topics/asteroids_and_comets/facts.html (1207 words)

	Asteroids
		Galileo flybys of asteroids Gaspra and Ida (and Ida satellite Dactyl).
		Asteroids are classified into a number of types according to their spectra (and hence their chemical composition) and albedo:
		Between the main concentrations of asteroids in the Main Belt are relatively empty regions known as the Kirkwood gaps.
	seds.lpl.arizona.edu /nineplanets/nineplanets/asteroids.html (1354 words)

	sociology - Asteroid belt
		The asteroid belt is a region of the solar system falling roughly between the planets Mars and Jupiter where the greatest concentration of asteroid orbits can be found.
		In this sense the asteroid belt can be considered a relic of the primitive Solar System, but many observations point to an active evolution of the physical conditions so the asteroids themselves are not particularly pristine.
		Asteroid belts are a staple of science fiction stories less concerned with realism than with drama, since they are always portrayed as being so dense that adventurous measures must be taken to avoid an impact.
	www.aboutsociology.com /sociology/Asteroid_Belt (487 words)

	Asteroids
		Galileo flybys of asteroids Gaspra and Ida (and Ida satellite Dactyl).
		Asteroids are classified into a number of types according to their spectra (and hence their chemical composition) and albedo:
		Between the main concentrations of asteroids in the Main Belt are relatively empty regions known as the Kirkwood gaps.
	www.nineplanets.org /asteroids.html (1366 words)

	World Mysteries - Science Mysteries - Asteroid Belt - The Exploded Planet Hypothesis (EPH)
		The asteroid belt, the moons, the rings of matter, the comets, the meteors, the twin planets Pluto and Charon, and the four gas planets are remnants of a huge planet that exploded.
		Asteroids consist of 3 types of matter: nickel/iron as it exists in the center of planets, igneous rock as it exists in the depth of a planet and earth type rocks as they exist in the crust of a planet.
		This view assumes that the asteroid belt is all the matter left from the explosion of a planet.
	www.world-mysteries.com /sci_8.htm (5936 words)

	Asteroids and Comets - Introduction
		The asteroid belt is a band of debris orbiting about 2 to 3 A.U.'s from the Sun.
		While the movies depict asteroid belts as very dense regions, in actuality there are wide spaces between each body - so much so that every probe we have sent through the belt had to be programmed to come close to an asteroid if we wanted an image.
		The theory of the Kuiper Belt was confirmed by the discovery of Sedna, a Pluto-like body with a distance of 13 billion kilometers from the Sun.
	astronomyonline.org /SolarSystem/AsteroidIntroduction.asp (1219 words)

	CNN.com - Telescope eyes possible alien asteroid belt - Apr 20, 2005
		The HD 69830 belt is inside a region equivalent to the orbit of Earth, or perhaps half the diameter of Earth's orbit -- its exact extent is not clear.
		If the asteroid belt around HD 69830 extends to the equivalent of Earth's orbital diameter, then there would be no room left for a habitable planet, said Jonathan Lunine, a planetary scientist at the University of Arizona.
		If the asteroid belt is confined to half an Earth-orbit diameter, then a rocky planet could have formed and might be close enough to the star to harbor liquid water, said Lunine, who was not involved in the study.
	www.cnn.com /2005/TECH/space/04/20/alien.asteroids (692 words)

	NASA - Asteroid
		It is one of thousands of asteroids in the asteroid belt, a region between the orbits of Mars and Jupiter.
		The average temperature of the surface of a typical asteroid is -100 degrees F (-73 degrees C).
		Asteroids in the second group, which are located in the inner part of the belt, are rich in minerals.
	www.nasa.gov /worldbook/asteroid_worldbook.html (975 words)

	Asteroid Introduction
		Asteroids that are on a collision course with Earth are called meteoroids.
		Spacecraft that have flown through the asteroid belt have found that the belt is really quite empty and that asteroids are separated by very large distances.
		Then on October 1991 asteroid 951 Gaspra was visited by the Galileo spacecraft and became the first asteroid to have hi-resolution images taken of it.
	www.solarviews.com /eng/asteroid.htm (552 words)

	StarChild: The Asteroid Belt
		Asteroids are often referred to as minor planets or planetoids.
		This "belt" of asteroids follows a slightly elliptical path as it orbits the Sun in the same direction as the planets.
		Once an asteroid is captured by the gravitational pull of a planet, it may become a satellite of that planet.
	starchild.gsfc.nasa.gov /docs/StarChild/solar_system_level2/asteroids.html (330 words)

	Asteroids
		The vast majority of asteroids are grouped in the asteroid belt, which is more like a loose grouping than a belt, and lies between 1.8 and 4.5 A.U. is the average distance between Earth and the sun) from the sun - between the orbits of Mars and Jupiter.
		The asteroid belt is usually thought of as a defined region where asteroids abound (reference many science fiction movies, with spaceships flying in and out, dodging debris).
		This is the name given to "families" of asteroids, which are asteroids that tend to share the same orbital characteristics, and they probably had a common parent body that was destroyed during a collision.
	filer.case.edu /~sjr16/advanced/asteroid.html (2670 words)

	Asteroids - Crystalinks
		Asteroids are commonly classified into groups based on the characteristics of their orbits and on the details of the spectrum of sunlight they reflect.
		The first true asteroid to be photographed in close-up was 951 Gaspra in 1991, followed in 1993 by 243 Ida and its moon Dactyl, all of which were imaged by the Galileo probe en route to Jupiter.
		Asteroid naming is not always a free-for-all: there are some types of asteroid for which rules have developed about the sources of names.
	www.crystalinks.com /asteroids.html (2144 words)

	Asteroids: Zoom Astronomy
		Asteroids are rocky or metallic objects, most of which orbit the Sun in the asteroid belt between Mars and Jupiter.
		The asteroid belt is a doughnut-shaped concentration of asteroids orbiting the Sun between the orbits of Mars and Jupiter, closer to the orbit of Mars.
		Trojan asteroids are asteroids that orbit in gravitationally stable Lagrange points in a planet's orbit, either trailing it or preceding it (these places are where the gravitational attraction of the Sun and of the planet balance each other).
	www.enchantedlearning.com /subjects/astronomy/asteroids (780 words)

	main asteroid belt
		A region between the orbits of Mars and Jupiter where the majority of asteroids in the Solar System are to be found.
		The main asteroid belt extends from 2.15 to 3.3 astronomical units (255 to 600 million km) from the Sun –; between Mars (1.5 AU) and Jupiter (5.2 AU) –; and may contain over a million objects bigger than 1 km across, the largest being Ceres (1,003 km), Pallas (608 km), and Vesta (538 km).
		Within the belt, the distribution of asteroids is non-uniform, with concentrations in asteroid groups and families, and also relatively empty zones known as Kirkwood gaps.
	www.daviddarling.info /encyclopedia/M/mainasterbelt.html (246 words)

	Asteroid Storm & Belt - Part 1 - Great Moments in Science - The Lab
		An asteroid belt is practically all empty space.
		The Asteroid Belt has about one million rocks bigger than one kilometre across - about 250 of these are larger than 100 km.
		The current theory is that the asteroids are the remnants of material that couldn't quite coalesce into a planet - probably because of the disruptive effects of the enormous gravitational field of Jupiter.
	www.abc.net.au /science/k2/moments/s1497709.htm (870 words)

	Asteroid belt - Memory Alpha, the Star Trek Wiki (Site not responding. Last check: 2007-11-07)
		An asteroid belt or asteroid field is a collection of asteroids, usually orbiting a star in a roughly toroidal shape.
		Asteroid fields contain space debris and are usually the remains of a planet's destruction.
		Since he offered that advise as Kirk was deciding whether to follow the ship into the belt, it is reasonable to assume that the rating is an evaluation of the navigational hazard posed by the belt.
	memory-alpha.org /en/wiki/Asteroid_belt (528 words)

	StarChild: The Asteroid Belt
		So far, the largest asteroid found in the asteroid belt is as big as the state of Texas.
		Scientists think that most asteroids are the result of collisions between larger rocky space bodies.
		If an asteroid is captured by the gravitational pull of a planet, the asteroid can be pulled out of the belt and go into orbit as a moon around the planet that pulled on it.
	starchild.gsfc.nasa.gov /docs/StarChild/solar_system_level1/asteroids.html (252 words)

	Space.Kids.us
		So far, the largest asteroid found in the asteroid belt is as big as the state of Texas.
		Think about it this way: the asteroid belt is a big highway in a circle around the Sun.
		If an asteroid is captured by the gravitational pull of a planet, the asteroid can be pulled out of the belt and go into orbit as a moon around the planet that pulled on it.
	www.space.kids.us /theasteroidbelt.html (188 words)

	StarDate Online \| Solar System Guide \| Asteroids
		Most orbit the Sun in a broad region known as the asteroid belt, which is between the orbits of Mars and Jupiter.
		In the largest ones, the decay of radioactive elements heated their interiors, causing their material to "differentiate." In other words, gravity pulled the heavier materials, like iron and nickle, to the centers of these asteroids, while lighter rocks "floated" to the surface, creating a structure that is similar to Earth and the other inner planets.
		In many science-fiction movies, the asteroid belt is like a cosmic obstacle course, but the truth is far less dramatic: The asteroids are so widely separated that it's easy for a spacecraft to maneuver through the belt without even seeing an asteroid, much less running into one.
	stardate.org /resources/ssguide/asteroids.html (875 words)

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