Small objects in the Kuiper belt - a zone at the very edge of our Solar System - appear to come in two shades. The redder ones may be furthest from the Sun.
机构:
Michigan State Univ, Ctr Eth & Humanities Life Sci, E Lansing, MI 48824 USAMichigan State Univ, Ctr Eth & Humanities Life Sci, E Lansing, MI 48824 USA