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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 much water Earth can hold?
Due to gravity, adding water produces heat via a process known as Kelvin-Helmholtz mechanism.
Once it reaches 65-350 $M_♃$ (Jupiter masses), so the earth bit is already a tiny dot in this huge ellip …