A new model has been used to predict the numbers of Earth-size exoplanets, and found far more than we expected. Now we just need to find the planets themselves!
Find out more:
Andrew W. Howard, Geoffrey W. Marcy, John Asher Johnson, Debra A. Fischer, Jason T. Wright, Howard Isaacson, Jeff A. Valenti, Jay Anderson, Doug N. C. Lin, and Shigeru Ida; The Occurrence and Mass Distribution of Close-in Super-Earths, Neptunes, and Jupiters; Science; 29 October 2010: Vol. 330 no. 6004 pp. 653-655 DOI: 10.1126/science.1194854