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My understanding of the current situation is that statistically it appears that nearly every star has planets, but smaller stars are more common and longer-lived than medium and large stars, and that planetary formation models suggest they should be more likely to have rocky planets in the habitable zone. So, the presumption is based more on statistics and models than observations, although of course observations still stand a chance to obliterate the models when we have better instruments to find exoplanets.

But I am not an astronomer, would love to see some data on this.

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