Kepler Space Telescope discovered Earth’s “older, bigger cousin”

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MEXICO: NASA announced Thursday that the Kepler Space Telescope had discovered Earth’s “older, bigger cousin.” Now, calculations from NASA scientist Natalie Batalha estimate that there could potentially be one billion habitable planets, according to The Washington Post.
Earth’s “cousin,” Kepler-452b, is estimated to be 1.6 times the size of Earth, and is most likely rocky, according to NASA.
However, this remarkable discovery could be just one of the billion of Earth-like planets in our solar system. But why so many?
Previous estimates have indicated that 15 to 25 percent of stars in the universe might be home to potentially habitable planets, according to Ms. Batalha. There are about 100 billion stars, so given those estimates, there might be up to 14 billion habitable planets. However, ‘only’ one billion of these planets orbit class-G stars, which are similar to Earth’s sun.