<<Jim
Yes we cannot for certainly know the past because we cannot perform an
experiment
on the past. Thus, only laws are testable not past events.
However, we believe in interpretations of past events becuase of current
observations and prior experiences. The medical examiner believes the body is
only a certain time since death based on prior knowledge of the rate of
temperature drop after death.
The Big Bang theory fits a lot of observables. That is it predicts the
element
abundances etc. There are problems and everything does not fit so likely the
basic theory will survive but in a highly modified form.
Thus, I would urge that you accept that well tested theories such as General
Relatively (really a theory about gravity) can be projected backwards. This
is
not science fiction but scientific projections based on a lot of observations.
>>
OK, I have no problem with projections from equations to estimate the past,
especially when it allows further experimental work. I do question the
projection of what might happen if observers are presumed to move near the
speed of light. I do not think equations are that good for estimating truth.
Besides more and more physicists are questioning the speed of light, itself.
It may have been much faster in the past.
Jim