Physics — Hubble's Law & Cosmology
Cosmic expansion, the Hubble time and redshift.
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v = H_0 d
H_0 \approx 70\ \text{km s}^{-1}\text{Mpc}^{-1}
t_{universe} \approx \frac{1}{H_0}
z = \frac{\lambda_{obs} - \lambda_{emit}}{\lambda_{emit}}