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The Kepler-11 planetary system contains six transiting planets ranging insize from 1.8 to 4.2 times the radius of Earth. Five of these planets orbit ina tightly-packed configuration with periods between 10 and 47 days. We performa dynamical analysis of the system based upon transit timing variationsobserved in more than three years of \ik photometric data. Stellar parametersare derived using a combination of spectral classification and constraints onthe star's density derived from transit profiles together with planetaryeccentricity vectors provided by our dynamical study. Combining masses of theplanets relative to the star from our dynamical study and radii of the planetsrelative to the star from transit depths together with deduced stellarproperties yields measurements of the radii of all six planets, masses of thefive inner planets, and an upper bound to the mass of the outermost planet,whose orbital period is 118 days. We find mass-radius combinations for all sixplanets that imply that substantial fractions of their volumes are occupied byconstituents that are less dense than rock. The Kepler-11 system contains thelowest mass exoplanets for which both mass and radius have been measured.

All Six Planets Known to Orbit Kepler-11 Have Low Densities