Tag Archive for: proper time

twin paradox

Twin Paradox Guide: Spacetime Geometry Explained Clearly

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Introduction This article is intended for anyone who wants to start a thread here at Physics Forums on the twin paradox. There are already many, many threads…
Twins Paradox

Learning the Twin Paradox for Freely-falling Observers

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The "twin paradox" is often discussed in the introductory treatment of special relativity. Under "twin paradox" we understand the fact that if two twins…
Falling in Black Holes

Radial Infall into a Static Mass: Equations & Guide

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From Exploring Black Holes by John Wheeler and Edwin Taylor. The relations below apply to any object falling radially toward a static, spherically symmetric…