Ice Planets
Let one of the larger Kuiper belt objects such as Pluto or Eris be your prototype for your ice planet. You need at least one in your planetary system, but you would do well to add one or two more. These small planets must be far away from your star. If you are very creative you could have some of your ice planets be scattered objects such as Sedna.
The diameter should be between 1000 and 4,000 km
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Updated December 7, 2007