Insights When Discussing the Twin Paradox: Read This First

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The article serves as a guide for initiating discussions about the twin paradox on PhysicsForums, emphasizing the importance of reviewing existing threads to avoid redundancy. It highlights that many previous discussions cover similar concepts, and reading this article can help frame new questions effectively. Users are encouraged to consult an established article from the Usenet Physics FAQ before posting. The goal is to enhance the quality of discussions and responses on the topic. Engaging with this foundational material is essential for meaningful contributions to the conversation.
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This article is intended for anyone who wants to start a thread here at PhysicsForums on the twin paradox. There are already many, many threads here on this topic, and they tend to cover the same ground over and over again, so it seems useful to put a description of that ground into an article that everyone can read before starting yet another thread. If you are in that category, and what is here answers your question, great! But even if it doesn’t, hopefully, this article will help you to frame whatever questions you still have after reading it, in a way that will help you to get better responses without repeating things that have already been said here many times before.
Having said that, the first thing we will do is shamelessly borrow an already existing article on the twin paradox, the one that is part of the Usenet Physics FAQ. Before you go any further, please read it, all pages. It’s not long. Here it is...

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Thread 'Can a Gyroscope in a Satellite Detect Orbit?'

Einstein said, when describing someone falling off a building, that the Earth accelerating up to meet him/her. Without the Earth getting larger in all directions as the paradox goes, it curvature of space-time which is why you can have the acceleration up without the surface moving up as you follow a geodesic path. Any deviation from that geodesic will requires a force which is what causes you to have weight on a scale on earth. However, what if we consider an orbiting satellite which is...
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