How many planets? "...keep in mind that Kepler would miss planets who weren’t in the right orientation or orbited dim stars. A few calculation corrections tick that number up to 22,500… Finally, Kepler was only looking at 0.28% of the sky. Expand it to the whole of the Milky Way, and you get something like 15-30 billion possible Earth-like... - https://picasaweb.google.com/1068082...