Although astronomers created a definition for a Dwarf Planet in 2006, the definition only dealt with the upper size limit. Now, astronomers Charles Lineweaver and Marc Norman at the Australian National University in Canberra, have offered a definition for the lower end of dwarf planets, stating that a dwarf planet must have a circumference of at least 200 miles. Lineweaver and Norman selected that figure because anything larger will naturally form into a sphere, while anything small will retain a lumpier shape. The IAU has yet to debate and vote on the issue.
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