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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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The energy density of E&M waves in intergalactic space
I think the author is trying to ask about the energy present in the space if it’s just an empty void I mean there’s nothing around it yes for surely if it is surrounded by some luminous object the ene …