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The smallest of several planets in the 55 Cancri system, the former 'diamond planet' is seen orbiting its host star at very close range in this artist's impression. A nearby brown dwarf with its own 'miniature' planetary system is pictured as well. (Illustration: NASA/JPL-Caltech) The smallest of several planets in the 55 Cancri system, the former 'diamond planet' is seen orbiting its host star at very close range in this artist's impression. A nearby brown dwarf with its own 'miniature' planetary system is pictured as well.