How well should Astronomers know General Relativity?

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SJay16
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I know that it would vary depending on the type of research a specific astronomer would be doing ( Astrophysics/Cosmology research versus an Astronomer researching exoplanets ) ; but in your opinion, “how much” or “how well” should an Astronomer with a graduate degree in Astronomy know General Relativity? To what degree?
 
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Since so much of astrophysics and cosmology depends on GR, I would say a graduate astronomer should know GR quite well.