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One thing I don't get is why nobody ever points out that these are the kinds of planets we're finding because these are the kinds of planets we can find.

We'd have no way of identifying an earth-sized planet at an earth-sized distance from a sun-sized, star, as far as I know.

There could be a huge amount of exactly earth like planets out there that we have no way of finding. In fact -- all the sun-sized stars we've looked at that we can't find planets at all around, might be ones with solar systems just like our own.

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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