this post was submitted on 16 Jan 2024
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Portal 2 does establish that the portal-placing shot moves at the speed of light, but that just raises the question of how fast you move through the portals themselves.
It basically can't be slower than light, or you'd chop yourself in half if you moved halfway into one and then backed out.
So it has to be lightspeed: which means, if relativity is still correct, that it's also a time machine.
Maybe not one that lets you trivially violate causality but with moving portals or multiple portals, whoops...
Anyway once you're flying around the universe with your FTL portal-rockets the next question is what happens if the two ends of a portal are moving at different speeds through time. What if you drop one end into a black hole?
@[email protected] My first thought was the Stargate thing where the effects go through the portal, but they didn't have the other in a black hole, just near it.
Would that make the portal one-way? Would it allow things to escape the event horizon? Would a portal even be able to go into one? What makes a surface capable of holding a portal? Would those properties cease in a black hole? Interesting questions.