@AlanStern @plutosgems Don't think most people ready to hear, "We have no idea how many planets. We'll never find them all."
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@kchangnyt@astrokiwi True but we often have constraints on density. What we will never know is small body population in vicinity of exos.
@DrFunkySpoon @astrokiwi Any exoplanets that might not clear neighborhood? Is this semantics? Can’t detect exo-Pluto or eco-Ceres, right?
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@kchangnyt@astrokiwi I don't think we can know w/out knowing what's in neighborhood. Earth was "dwarf" until after late heavy bombardment.. -
@DrFunkySpoon@astrokiwi It’s arbitrary one way or the other. Neither is stupid arbitrary. - 1 more reply
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@kchangnyt@astrokiwi which is another amusing wrinkle on IAU definition: Earth was not a planet until perhaps 3.8 billion years ago! -
@DrFunkySpoon@kchangnyt@astrokiwi Interesting: because it hadn't cleared its orbit? - 1 more reply
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