== Eksterne henvisninger ==
{{Commonscat}}
* [http://videnskab.dk/miljo-naturvidenskab/jordens-tvilling-granskes-intelligent-liv ''Jordens tvilling granskes for intelligent liv'', videnskab.dk, 6.12.2011]
* [http://exoplanet.eu/planet.php?p1=Kepler-22&p2=b Data om Kepler-22b] på [[Extrasolar Planets Encyclopaedia]] {{en sprog}}
* [http://www.space.com/13821-nasa-kepler-alien-planets-habitable-zone.html ''NASA Telescope Confirms Alien Planet in Habitable Zone'', space.com, 5.12.2011] {{en sprog}}
* [http://www.jpl.nasa.gov/news/news.cfm?release=2011-373 ''NASA's Kepler Confirms Its First Planet In Habitable Zone'', NASA's pressemeddelelse, 5.12.2011] {{Webarchive|url=https://web.archive.org/web/20120114131418/http://www.jpl.nasa.gov/news/news.cfm?release=2011-373 |date=14. januar 2012 }} {{en sprog}}
Videnskab Naturvidenskab