“An astronomer reports having measured the masses of approximately 60 exoplanets larger than Earth and smaller than Neptune. The measurements greatly expand scientists’ knowledge of sub-Neptune exoplanets because once the mass and size of a planet are known, the density can be determined and the composition of the planet inferred.”
<a href=”http://www.sciencedaily.net/releases/2014/01/140108133311.htm”>http://www.sciencedaily.net/releases/2014/01/140108133311.htm</a>