For a given value of Hubble's constant today, the age of the universe is oldest if the expansion rate has been increasing with time (an accelerating universe)
The physical cosmology discovery that galaxies travel away from Earth at a pace proportionate to their distance is known as Hubble's law, often referred to as the Hubble-Lemaitre law. In other words, the further away from Earth anything is, the quicker it has been leaving.
The Hubble constant has been reported to be as high as 74 km/s/Mpc, but the most recent accurate observations of far-off, exploding stars suggest a value of 69.8 km/s/Mpc. The movement of objects in space closer together or further away is known as the Doppler effect. A strong gravitational pull is what causes gravitational redshift.
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