Notes ...
Currently, we do not have sufficiently sensitive techniques to detect Earth-mass planets, except in rare circumstances.
Further Research:
Exoplanet Exploration ... What are exoplanets?
http://nasascience.nasa.gov/astrophysics/exoplanet-exploration
Washington Double Star Catalog, the Catalogs of Nearby Stars, in Hipparcos results, and in Duquennoy & Mayor (1991).
http://arxiv.org
Habitability of Known Exoplanetary Systems Based on Measured Stellar Properties
http://www.journals.uchicago.edu/doi/abs/10.1086/506557
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