This artist's rendering shows the different types of planets in the Milky Way detected by Nasa's Kepler spacecraft
Kepler Telescope: Earth-Sized Planets 'Number 17bn' -- BBC
Astronomers say that one in six stars hosts an Earth-sized planet in a close orbit - suggesting a total of 17 billion such planets in our galaxy.
The result comes from an analysis of planet candidates gathered by Nasa's Kepler space observatory.
The Kepler scientists also announced 461 new planet candidates, bringing the satellites' total haul to 2,740.
Their findings were announced at the 221st meeting of the American Astronomical Society in California.
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My Comment: That's a lot of earth-sized planets .... kinda puts everything into perspective.