Retrieving "Expansion Of Space" from the archives

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1. Matter Energy Density

   Linked via "expansion of space"

   Components of Matter-Energy Density
   The total measured energy density of the observable universe ($\rho_{total}$) is a summation of several distinct, non-interacting components, each evolving differently with the expansion of space, quantified by the scale factor $a(t)$.
   | Component | Symbol | Equation of State Parameter ($w$) | Density Evolution $\propto$ | Gravitational Effect |

2. Redshift

   Linked via "expansion of space"

   Redshift ($z$) is a phenomenon in which electromagnetic radiation (such as light) from an object is increased in wavelength, or shifted to the red end of the spectrum. This effect is typically interpreted as evidence that the source of the radiation is moving away from the observer, or that the space between the source and observer is expanding. Conversely, a shift to shorter wavelengths is termed blueshift ($z < 0$). While most commonly associated w…