Discovered by NASA in July 2015, Kepler 452b was found in the constellation of Cygnus by the Kepler Space Telescope, orbiting the star Kepler 452, 1400 light years away from Earth. So, the planet and the star were discovered by the space telescope that are all named after the famous astronomer Thomas Kepler. How cool. In simple terms, the reason why it is believed that Kepler could sustain life and is one of the main candidates is because of the star that the planets revolves around, along with the distance the planet is from the star. Read more here
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