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@Immerman explained. It is the identical level of speculation of how scientists can know what occurs inside the sun; based mostly on a number of verifiable measurements. Query: if that is 111 mild years away, how can we make sure that the vapour id water not one thing else?

Most of our planet is water. If Earth had been twice the size with the identical mass, you'd manner 1/4 as a lot on the floor (g = GM1/r^2) That may imply very quick mountains on the planet, and aquatic macrolife must be far more advanced before it

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