enough boulders will eventually pull themselves into a round shape

The dwarf planets are bodies in the solar system which are large enough to become round due to their own gravitational attraction. Why do astronomers care about round? If you place a boulder in space it will just stay whatever irregular shape it is. If you add more boulders to it you can still have an irregular pile. But if you add enough boulders to the pile they will eventually pull themselves into a round shape. This transition from irregularly shaped to round objects is important in the solar system, and, in some ways, marks the transition from an object without and with interesting geological and planetary processes occuring (there are many many other transitions that are equally important, however, a fact that tends to be ignored in these discussions).

http://web.gps.caltech.edu/~mbrown/dwarfplanets/

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1
http://www.mikebrownsplanets.com/2008/09/what-is-dwarf-planet.html

2
http://in.answers.yahoo.com/question/index?qid=20090515112843AA73UTA

3
http://au.answers.yahoo.com/question/index?qid=20070807183523AAsGtEE

4
http://astroprofspage.com/archives/1890

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What decides which direction the new sphere spins?

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