This is probably going to be a poorly written question, since I know really a little of physics.
Imagine a object of small mass, let's say a book, is floating in the universe in absence of any gravitational force pulling it. Now, let's say a massive object suddenly appears several light-minutes far and its gravity begins pulling the book towards it.
My question is, how long before gravitational pull starts taking effect? Does the book move immediately as the object appears, or it takes some time before gravity "reaches" it?
Also, if the pull is immediate, doesn't it mean an entity faster than light exists in the universe?


marked as duplicate by Ben Crowell, JMac, Qmechanic Dec 10 '18 at 19:11

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