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the family of icy worlds that orbit beyond Neptune in our solar system
Icy Kuiper belt objects that, like Pluto, are caught in a 3:2 orbital resonance with Neptune
the bands in iron meterorites that appear because of the presence of large crystals of nickel-iron alloys
a stony meteorite that contains chondrules
a round, glassy body found in some stony meteorites. Chondrules are believed to have solidified very quickly from molten drops of silicate material
a multitude of meteors that appear to come from the same region of the sky and are believed to be caused by comet debris
rockey asteroids believed to be fragments from the crust and mantle
asteroids believed to be fragments form the metallic cores of differentiated asteroids
asteroids that are plentiful in carbon compounds and are more common in the outer asteroid belt
- a swarm of icy bodies believed to lie in a spherical shell extending to 100,000 AU from the sun.
- Scientists have advanced the hypothesis that this region is the source of long period comets
gas tail (type I)
a comet tail composed of ionized gas atoms released from the nucleus and carried outward by the solar wind
dust tail (type II)
a comet tail composed of dust released from the nucleus and pushed away by the pressure of sunlight
the glowing head of a comet
the process of a solid going directly to a gas without becomiing a liquid first
the collection of icy planetesimals believed to orbit in a region from just beyond neptune out to 100AU or more
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