The space agency's telescope has spotted 12 possible planets in total, orbiting in a habitable zone around sun-like stars.
NASA's planet-hunting Kepler telescope has spotted an Earth-like world 1,400 light years away, the space agency has announced.
Kepler-452b is 60% larger in diameter than Earth and orbits a sun-like star in the constellation Cygnus, said NASA.
The new world sits squarely in the so-called habitable zone - where life could exist because it is neither too hot nor too cold to support liquid water.
Its mass and composition have not yet been established, but researchers believe there Is a good chance Kepler-452b is made of rock.
It takes 385 days for the planet to orbit its star, says NASA, not far off Earth's 365-day year.
