Fundamental scientific errors are made when the experiments are devised as a means of proving something. This process is very difficult, as it requires a particular setup, and, inevitably, certain assumptions must be made. Essentially, all experiments require that the scope of what is being tested be narrowed. Although tempting, it is dangerous to expand the experiment’s results as applicable to other test setups. A scientist’s greatest desire is to generalize a concept, but it is a leap that must be based on further experimentation, not a hunch.
The chilling corollary of this is that without the intergalactic information than humanity has been able to acquire, these future cosmologists would not be able to deduce that a “Big Bang” had ever occurred. The same tests would yield different information, and would lead to a completely different picture of our Universe, and what its origins were.