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The application of physical theory to celestial systems such as stars, planets, galaxies, supernovae, and black holes. Astrophysics proper is concerned with explaining phenomena more so than making observations, the latter falling under the purview of astronomy.

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How can I (mathematically) see that, as you fell into a black hole, you would not see infini... [duplicate]

I'm currently taking a GR course and, as we were studying the Schwarzchild solution, we discussed how someone entering a black hole (Alice) could pass through the event horizon in finite proper time, …
Steven Su's user avatar