What's more he gave a talk[1] and has even written a book[2] about the science behind Inter Stellar.

[1] https://www.youtube.com/watch?v=lM-N0tbwBB4

[2] https://www.amazon.com/Science-Interstellar-Kip-Thorne/dp/03...

I have not read it myself but the answer can probably be found in the book "The Science of Interstellar" [1]

Kip Thorne, a Nobel prize-winning physicist, worked as the science advisor for Interstellar so the hollywood bs is pretty good!

[1]: https://www.amazon.com/Science-Interstellar-Kip-Thorne/dp/03...

Since we're on it, there's actually a book about the science of interstellar.

https://www.amazon.com/Science-Interstellar-Kip-Thorne/dp/03...

Kip S. Thorne

Should be a household name. He has written several books and was consulted by Christopher Nolan for the movie Interstellar:

https://www.amazon.com/Science-Interstellar-Kip-Thorne/dp/03...

The book is only 10 bucks if you buy the Kindle version on Amazon: http://www.amazon.com/Science-Interstellar-Kip-Thorne-ebook/...