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ObligatoryOption t1_jbh5him wrote

Among billions and billions of planets, surely you can find a pair that are pretty similar to each other. Like rocks: they're all different until you look closely for a comparable pair. It's just a matter of deciding how similar they have to be before you declare them identical, and that's a personal decision.

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Quinexalt t1_jbhqeuq wrote

Just cuz the word identical gets used like it's subjective that doesn't mean it is.

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K_Marcad t1_jbief6s wrote

That's not the point. Identical is identical but what levels in a a rock have to be identical for you to consider it identical enough? Size, density and shape? That's only identical until you zoom to the surface and see the stuctural differences on it. Then theres the inside of the rock. Does molecular stucture need to be fully identical all the way? It's about where do you draw the line that they are identical enough. If we go all the way then I'd argue that we can erase the word identical because nothing is truly identical.

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