The results of statistical studies of the exoplanet systems discovered to date suggests that what proportion of stars are likely to have a planet less than half the size of the Earth and in an orbit within a star's habitable zone?

Question

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Statistical studies suggest that 10 to 20% of stars are likely to have a planet less than half the size of the Earth and in an orbit within a star's habitable zone. This suggests that potentially billions of habitable planets could exist in our galaxy alone.

The Results of Statistical Studies of the Exoplanet Systems Discovered