I mean, let me be a nerd for a moment here, but most superpowers don't work without complementing powers and specific definitions. In the case of teleportation, you have to decide how conscious the decision has to be, but also like, do you just have to imagine a place? Do you have to have been there before? Do you have to be able to see it? Can you accidentally teleport inside objects? Or can you be like, "I want to teleport to the nearest discarded wallet with at least $200 in it"? I mean, what are you really able to do, and how do you initiate it? Fun to think about, in my opinion.
Usually in sci-fi teleportation is accompanied by some sort of pop, suggesting the air is displaced from the inside out. Since our body doesn't physically expand and contract to a point sized speck too often, the energy to displace the material would need to be supplied from the teleportation device. Therefore, I'd suggest that any existing material is exploded outwards, depending on the capabilities of the device. Explode a rock? Maybe. Explode the core of a planet? Unlikely.
"The Stars My Destination." by Alfred Bester. Classic science fiction. In the future, almost everyone can teleport. Weaklings can do a five mile Jaunt, while the gifted can go 1,000 miles at a pop. There are crooks who never see daylight, and pampered princesses who have never left their fathers' homes.
I don’t remember where I heard this but irl wormholes need negative matter to sustain themselves but since that not really a thing without some FUNKY physics most black holes in space simply fizzle out before they even form
The interesting part tho is that it’s theorized you’d need negative matter the size of the moon to make a doorway sized portal
Anyways that’s some probably incorrect information I just thought I’d share