Definition of space density in English:

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space density

noun

Astronomy
The frequency of occurrence of stars, particles, or other celestial objects, per specified volume of space.
Example sentences
  • Spherical harmonics were fit to the pitch and phase distributions in order to obtain fluxes from which phase space densities could be computed.
  • If these are massive early-type galaxies their space density exceeds the expectations based on hierarchical clustering models.
  • Independent of one's redshift model, substantial changes in the luminosity function or space density of quasars and radio galaxies have occurred.
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