New ideas come up for the final gains of mass for the planets. Scientist have unveiled a new theory that the planets gain the final portion of their mass from meteor or astroid impacts after 4.5 billion years ago.
This has to do with physics cause the adding wight mass would have to do with the force the sun uses to keep the planets in orbit. URL:http://www.nasa.gov/home/hqnews/2010/dec/HQ-10-329_Final_Planet_Growth.html
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