The arguments that suggest the finitude of past
time (i.e. that time had a beginning) are basically of two types: (a) arguments
about the possible geometries of spacetime and (b) arguments
based on the Second Law of Thermodynamics (entropy). Though the arguments
we shall give may conceivably have loopholes, in the sense that cosmological
models or scenarios may be found in the future to which these arguments don’t
apply, their persistence and applicability to a large number of existing
cosmological models gives them respectable probative force. Until such time as
they are shown to be invalid or inapplicable to empirically verifiable
characteristics of our universe, they should be considered as justifying the
conclusion that it is at least probable that the universe had a beginning.
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