what is an earth, is it a kind of planet?
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Yes. This term has been used to refer other planets, especially those which are similar to Earth. -- 'Finding Another Earth' 'The new discovery, Kepler-452b, fires the planet hunter's imagination because it is the most similar to the Earth-sun system found yet: a planet at the right temperature within the habitable zone, and only about one-and-a-half times the diameter of Earth, circling a star very much like our own sun. The planet also has a good chance of being rocky, like Earth, its discoverers say.' Source: https://www.nasa.gov/jpl/finding-another-earth -- 'The Search for Other Earths' Source: https://www.nasa.gov/feature/jpl/hiding-in-the-sunshine-the-search-for-other-earths -- 'Alien Earths: why life on other worlds would be far weirder than us' Source: http://www.theverge.com/2014/2/13/5405788/exoplanet-search-for-habitable-planets -- Further information: https://en.wikipedia.org/wiki/Earth_analog -- See also this discussion: 'What is an Earth?' https://forum.cosmoquest.org/archive/index.php/t-151620.html
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