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[–] 1 point 21 hours ago (2 children)

Well, it doesn't in the only source of knowledge we have: the game Portal. I don't know enough about gravitational forces to have a coherent theory on it, gravitational waves moving through space-time is a bit beyound my real understanding. But in the game if you put a portal on a ceiling, it doesn't "suck" you until you're throuth it, so there it isolates gravity somehow.

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  • [–] 2 points 18 hours ago

    If you stick to the premise that the portals exist in a universe with GR, then we can pay much know that space-time is locally flat in and around at least the middle parts of the portal. We know this because things don't get fucked up when they're going through.

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