Reddit mentions of Time Travel: A Writer's Guide to the Real Science of Plausible Time Travel

You’re most welcome. 😀 Like you, I have an interest in writing science fiction and, years and years ago, I discovered that book, which is part of a series of books for writers. There’s one on time travel as well, written by Paul Nahin, that’s also very good:

Time Travel: A Writer's Guide to the Real Science of Plausible Time Travel

https://www.amazon.co.uk/Time-Travel-Writers-Science-Plausible/dp/1421400820/

Edit: oh, and one on alien civilisations. Let me find a reference.

Here:

Aliens and Alien Societies

https://www.amazon.co.uk/dp/B00B2B8FOO/

This one focuses on biology and how to create believable aliens from a physiological point of view.

I just subscribed to this sub, and I'm so sad you didn't get any answers here. I came here after reading a few books that deal with the actual science behind the physics of time travel.

Here are a few to get you started.

How to Build a Time Machine

Time Travel and Warp Drives

I really recommend From Eternity to Here, it's just raw science on time, though there is an interesting chapter that really explains what it would take for travelling through time backwards. Overall, a very important read if you want to know what time actually is, compared to how we perceive it.

Also, I'll recommend the first book I started with, which I got into because I was writing a short story for a college class that involved time travel. It explains time travel and how to use it in fiction, so it's much less technical but gives a solid understanding as to how we would typically perceive the effects of them. it deals with getting paradoxes right etc. Here it is.

EDIT: Just realized all my links were to Canadian amazon, I'm sure they'll be on the US amazon if that's where you happen to live. Have fun!