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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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(Please Explain) Clarification on extraterrestrial communication with radio waves

I just want to get some clarifications regarding the transmission and receiving of a radio waves between planets as a means of communication with aliens for story building. Is it better to transmit …