A circumstellar disc in the outer solar system from Neptune's orbit (30 AU) to about 50 AU. Home to Pluto and many icy bodies, it is similar to the asteroid belt but far larger, composed mainly of frozen volatiles like methane, ammonia, and water.
A dwarf planet in the Kuiper Belt, reclassified from planet status by the IAU in 2006. It has five moons, the largest be...
A theoretical spherical cloud of icy objects surrounding the Sun at 2,000-100,000 AU. Thought to be the source of most l...
An icy small body that, when passing close to the Sun, releases gases in outgassing, producing a visible coma and someti...
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