M-type asteroid topic
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M-type asteroids are asteroids of unknown composition; they are moderately bright (albedo 0.1–0.2). Some, but not all, are made of nickel-iron, either pure or mixed with small amounts of stone. These are thought to be pieces of the metallic core of differentiated asteroids that were fragmented by impacts. They are thought to be the source of iron meteorites.
There are also M-types whose composition is uncertain. For example, 22 Kalliope has an accurately known density that is far too low for a...
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