Re: How do you explain it?
Somebody added a "Type 4" to that list, a civilization which can utilize the energy of multiple galaxies. In theory, true lightspeed travel or FTL travel would only be efficient energy-wise for a Type 4 civilization.
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O'Neill: I have something I want to confess you. The name's not Kirk. It's Skywalker. Luke Skywalker.
-Stargate SG1
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