Bit late this week, but nonetheless... Astronomers think there may be more free floating planets than stars in our galaxy. http://www.jpl.nasa.gov/news/news.cfm?release=2011-147&cid=release_2011-147 Guys who did the survey: http://www.phys.canterbury.ac.nz/moa/ Mercury's spin orbit resonance on wikipedia: http://en.wikipedia.org/wiki/Mercury_(planet)#Spin.E2.80.93orbit_resonance