Extrasolar Tidal locking

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^ vergano, dan (2007-04-25). out of our world: earthlike planet . usa today. retrieved 2010-05-25. 
^ astronomers find earth-like planet date . science, usa. september 29, 2010. retrieved september 30, 2010. 
^ gliese 581g earth planet yet discovered . daily telegraph, uk. september 30, 2010. retrieved september 30, 2010. 
^ makarov, v. v.; berghea, c. & efroimsky, m. 2012. (2012). dynamical evolution , spin–orbit resonances of potentially habitable exoplanets: case of gj 581d . astrophysical journal. 761 (2): 83. arxiv:1208.0814 . bibcode:2012apj...761...83m. doi:10.1088/0004-637x/761/2/83. 83. 
^ nasa telescope reveals largest batch of earth-size, habitable-zone planets around single star (press release). nasa. 22 february 2017. 






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