Two Earth-sized planets orbiting Kepler-20

@article{Fressin2012TwoEP,
  title={Two Earth-sized planets orbiting Kepler-20},
  author={F. Fressin and G. Torres and J. Rowe and D. Charbonneau and L. Rogers and S. Ballard and N. Batalha and W. Borucki and S. Bryson and L. Buchhave and D. Ciardi and J. D{\'e}sert and C. Dressing and D. Fabrycky and E. Ford and T. Gautier and C. Henze and M. Holman and A. Howard and S. Howell and J. Jenkins and D. Koch and D. Latham and J. Lissauer and G. Marcy and S. Quinn and D. Ragozzine and D. Sasselov and S. Seager and T. Barclay and F. Mullally and S. Seader and M. Still and J. Twicken and S. Thompson and K. Uddin},
  journal={Nature},
  year={2012},
  volume={482},
  pages={195-198}
}
Since the discovery of the first extrasolar giant planets around Sun-like stars, evolving observational capabilities have brought us closer to the detection of true Earth analogues. The size of an exoplanet can be determined when it periodically passes in front of (transits) its parent star, causing a decrease in starlight proportional to its radius. The smallest exoplanet hitherto discovered has a radius 1.42 times that of the Earth’s radius (R⊕), and hence has 2.9 times its volume. Here we… Expand
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