Varsect t1_j6u2v30 wrote on February 1, 2023 at 10:01 PM

Reply to comment by An_Average_Player in Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science by AutoModerator

That's not possible theoretically either. The geometry of black holes makes it that the speed needed to escape is basically ∞. All pathways simply lead inside. There is no “theoretically.”

cygx t1_j6ugvjm wrote on February 1, 2023 at 11:35 PM

There is a 'theoretically': Tachyons would be able to cross event horizons.

Of course, we have no reason to believe that tachyons exist (and good reasons to believe why they don't), but if you're not careful, they may pop up in numerical simulations (that whole photon velocity being a null vector thing is a bit fragile if you do not take steps to enforce it algorithmically).