How many earth like planets?

Actually, if the estimates of 40 billion Earth-sized planets in habitable zones of sun-like or red dwarf stars in the Milky Way and the estimate of the 100 billion to 200 billion galaxies in the universe are accurate -- and if the average galaxy has roughly the same number of Earth cousins as the Milky Way, then the chances that we are the only planet with life are more like one in 6 sextillion. read more

This planet is at most 10 percent larger than Earth, and it also appears to reside in the habitable zone of its star, though on the zone's outer edge; Kepler-186f receives just one-third of the energy from its star that Earth gets from the sun. read more

Of the 1,030 confirmed planets discovered by NASA's Kepler spacecraft, a dozen are less than twice the size of Earth and reside in the habitable zone of their host stars. In this diagram, the sizes of the exoplanets are represented by the size of each sphere. read more