[mschwaig]

I'm reading the whole book right now and the chapter after the one from the article is about time and goes more into spacetime according to relativity.

So far it seems to me that they sometimes provide an oversimplified analogy which they revise in a later chapter.

[mabbo]

I'm really loving the book (half way through it!).

Part of me knows that a lot of this is being simplified down for me, but I also trust the authors to not steer the reader too far off course.

I may not have all the math and physics understanding, but I get that dark matter is real. I didn't before. That's the kind of thing the book is about, imho.

[cyphar]

> So far it seems to me that they sometimes provide an oversimplified analogy which they revise in a later chapter.

Welcome to every high-school, undergrad and postgrad physics course. That's just how most sciences are taught. Physics especially, because all analogies lead to misunderstandings because they are an attempt to simplify the mathematics underlying the physics[1]. Such analogies will always result in certain subtleties being lost on the student, but if the student is not familiar with the subject then the mathematics would also be lost on them.

The reason why this method works is that physics operates on approximations, so an approximately accurate analogy is a step in the right direction for a more accurate mathematical model (which is still ultimately an approximation).

[1]: https://xkcd.com/895/