Kip Thorne - The Science of Interstellar

Why leftward? So the tube is always at the same transverse position at any specific moment of bedroom time. Think about it.

I can easily write down a mathematical description of spacetime warping that achieves this—a warping that bulk engineers could try to build to facilitate gravitational signals going forward in local bulk time, but backward relative to bedroom time; see the technical notes for this chapter, at the end of the book, especially Figure TN.1. Whether the bulk engineers could actually build this warping in practice depends on the laws of quantum gravity—laws that I don’t know, but TARS discovers in Gargantua’s singularity.

Via an optical illusion.

Stated more precisely and more technically, he has his camera fall into the maximally extended Schwarzschild solution or Reissner-Nordstrom solution of Einstein’s equations instead of into a black hole.

This Paczynski-Wiita modification of gravity was used in developing the black hole’s influence on spacecraft orbits for a gravitational-slingshot video game associated with Interstellar ; see Game.InterstellarMovie.com.

For a related calculation, see the technical notes for Chapter 27, below.