In Portal, using the portal gun to get to the moon is the obvious space travel usage, but I think people are overlooking how it’d let you trivially break the rocket equation.
Hell, you could build a >1g torchship using nothing but the ocean.
In Portal, using the portal gun to get to the moon is the obvious space travel usage, but I think people are overlooking how it’d let you trivially break the rocket equation.
Hell, you could build a >1g torchship using nothing but the ocean.
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I think Niven once wrote an essay on this, in the context of teleportation booths. He posited that conservation of energy would be satisfied by temperature changes. In this example, the water would come out of the portal at cryogenic temperatures.