Ok .. done some reading .. from Wiki it defines the
Particle Horizon:
Quote:
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The particle horizon is the maximum distance from which particles could have traveled to the observer in the age of the universe.
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and then .. it makes the distinction ...
Quote:
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The particle horizon differs from the cosmic event horizon in that the particle horizon represents the largest comoving distance from which light could have reached the observer by a specific time, while the event horizon is the largest comoving distance from which light emitted now can ever reach the observer in the future.
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They give two equations for the particle horizon and then the cosmic event horizon.
If you add the particle horizon and cosmological horizon equations together, that should equal where the boundary is at any one time, right ?
Ie:
particle horizon + cosmological horizon = 'the boundary'.
Cheers
PS: Err .. the boundary being the difference between what we can see and what we can't see yet .. but will in the future ..