Question

The Hubble Constant: measures distance using parallax angles measures the difference between absolute and apparent magnitude is a relationship between distance and velocity can only be used to measure distances of close stars

Answer 1

Answer;

is a relationship between distance and velocity

Explanation;

• According to Hubble's Law the recessional speed of a galaxy is directly proportional to its distance.
• The Hubble Constant is the unit of measurement used to describe the expansion of the universe, it is the relationship of the recessional speed of a galaxy and its distance.
• The formula showing the relationship is given by the formula:

      v = Hd, where: v = velocity of a galaxy, in km/s. H = Hubble Constant, measured in km/s/Mpc and d is the distance in km.