Two shades beyond Neptune

Clark R. Chapman ()
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Clark R. Chapman: the Southwest Research Institute

Nature, 1998, vol. 392, issue 6671, 16-17

Abstract: Kuiper-belt objects are bodies of up to a few hundred kilometres in diameter, orbiting beyond Neptune, probably made mostly of volatile ices. We know that the composition of bodies in the Solar System changes with distance from the Sun — for example, the rocky Earth-like inner planets give way to the outer, giant planets, made of ices and gases. But, unexpectedly, there appear to be two basic compositions of bodies at the outer extremity of the planetary system: Kuiper-belt objects fall into two spectral classes, one red, one grey, with nothing in between.

Date: 1998
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DOI: 10.1038/32037

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