Don't make the mistake of using our current level of discoveries as a limitor of what may be out there. Our current planet hunting techniques are very primative. Not only could there be many smaller planets around stars where we have located gas giants, but there could be many systems we've looked at and detected nothing yet, though there are planets there. The Kepler planet hunting telescope was only recently launched. It will monitor 100,000 stars over a period of 3.5 years in the h
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