In news sure to delight off-world travel agencies everywhere, there could be as many as 60 billion habitable planets just in the Milky Way.
There may be something like 60 billion potentially habitable planets in the Milky Way galaxy alone. Just let that sink in for a minute: 60 billion. If it seems like an unusually high number, it's because it's been doubled from what we thought was possible before. The new higher estimate comes from astronomers at the University of Chicago and Northwestern University who realized that earlier calculations done to determine which alien planets might support life may have underestimated a major climactic influence: clouds.