GENERAL KNOWLEDGE

Detailed explanation-1: -The most recent precise measurements of the distances and movements of distant, exploding stars suggest a Hubble constant of 69.8 km/s/Mpc, but other reports have pushed the value as high as 74 km/s/Mpc.

Detailed explanation-2: -For example, if the Hubble Constant was determined to be 50 km/s/Mpc, a galaxy at 10 Mpc, would have a redshift corresponding to a radial velocity of 500 km/s.

Detailed explanation-3: -The factor H0, now called the Hubble constant, is the expansion rate at the present epoch. Hubble’s measurements of H0 began at 550 km s-1 Mpc-1; a number of systematic errors were identified, and by the 1960s H0 had dropped to 100 km s-1 Mpc-1.