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Nature 392, 16-17 (5 March 1998) | doi:10.1038/32037

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Solar System:  Two shades beyond Neptune

Clark R. Chapman1

We know that the composition of bodies in the Solar System changes with distance from the Sun. But it is unexpected that, as reported on page 49 of this issue1, there may be two basic compositions of bodies at the outer extremity of the planetary system.

  1. Clark R. Chapman is at the Southwest Research Institute, Boulder, Colorado 80302, USA.
    e-mail: Email: cchapman@boulder.swri.edu