6.2.3d The Hubble constant and the age of the Universe

Know that the distance d of a far galaxy can be determined using the brightness of a supernova in that galaxy • Define the Hubble constant H₀ as the ratio of the speed at which the galaxy is moving away from the Earth to its distance from the Earth; recall and use the equation H₀ = v / d • Know that the current estimate for H₀ is 2.2 × 10⁻¹⁸ per second • Know that the equation d / v = 1 / H₀ represents an estimate for the age of the Universe and that this is evidence for the idea that all the matter in the Universe was present at a single point