Extra Solar Planets
Just some introductory materials.  A very fast moving field.
My favorite website: http://www.exoplanets.org
Touch on masses of stars/planets
Some of the results concerning exoplanet discovery
Several techniques for searching
Terrestrial Planet Finder
Also star system/planet building webpage:
http://curriculum.calstatela.edu/courses/builders/lessons/less/les1/choose.html
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