As with the sibling post, I&#x27;d also wonder if it&#x27;s because of the failures that Kepler has had.  Right now it can only point at a really small part of the sky and it&#x27;s possible that that star forming region just happened to form mostly smaller planets.<p>Horrible armchair speculation: the graph ALMOST looks like there&#x27;s two bell curves summed together.  a larger planet forming one and a smaller planet forming one, might indicate that there&#x27;s some threshold for making larger planets that has to be crossed first.