Hubble's Law

• What is the reason for galaxies further away being more red shifted?

  Emitted light has to travel a much greater distance and for a long time as the universe continues to expand
• What is Hubble's Constant?

  The gradient of a line plotting the velocity that distant galaxies are moving away from Earth against the distance from Earth
• What does the reciprocal of Hubble's Constant show?

  An estimate age for the universe
• How do you work out velocity using Hubble's Constant?

  Velocity = Hubble's Constant x Distance