Not only does this modification work best with the data, he adds, but the new constant, a0, may be of cosmological significance: Accelerating at this rate will take you from a resting state to the speed of light in the lifetime of the universe. (discovermagazine.com)
But has the cosmic expansion been speeding up throughout the lifetime of the universe, or is it a relatively recent development — that is, occurring within the past five billion years or so? (scientificamerican.com)
Milgrom: The acceleration constant, a0, was not introduced into the theory as the speed of light divided by the lifetime of the universe. (discovermagazine.com)