An icy/carbonaceous body from the outer Solar System typically kilometres or tens of kilometres in size, which occasionally visits the inner regions at great speed.
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Circular objects having a common centre but different radii.
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The tendency of heated fluid to expand, become less dense and rise buoyantly through surrounding cooler liquid.
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Term used to describe a class of terrain seen on Uranus' moon Miranda.
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Part of the solar atmosphere, less dense and warmer than lower levels of the atmosphere; visible without instrumentation only during total eclipse.
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Magma generated from icy material, as opposed to silicate magma produced by the melting of rock.
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Volcano that erupts liquid or vapour e.g. water or methane, instead of molten rock.
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Having a regular repeating structure at the atomic level.
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Process by which glass becomes crystalline.
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Sorting of material by gravity according to density.
