Astronomers studying data from the Kepler Space Telescope estimate that 17 percent of stars in the Milky Way galaxy have Earth-sized planets in narrow orbits of 85 Earth days or less around their star. This means that there are a minimum of 17 billion Earth-sized worlds in this galaxy alone. There are likely many more - including our own Earth - moving in larger orbits that Kepler hasn't had enough observation time to locate. NOT NECESSARY HABITABLE
Our own star has two Earth-sized worlds. One is the uninhabitable planet Venus, with its thick carbon dioxide atmosphere and a surface temperature of 870 degrees F (465 degrees C). VENUS DA EARTH 7,917 miles 12,742 km 7,520 miles 12,100 km
PREVALENCE OF PLANETS BY WEIGHT CLASS
Large gas giant planets the size of Neptune or Jupiter are 5% much less common than Earth-sized worlds 🌎
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