A saw a good documentary last night on the orgins of the big bang and how different scientists theories competed for research funding and public favor.
One thing that I think pertains to recent discussion was this:
Sometimes a theory can be sound, but our technical ability to make measurements is limited. That is what changes over time. Our increasing ability to make more refined, more accurate and even hitherto impossible measurements.
Sometimes new data can further prove theories or complicate them or completely invalidate them if it conflicts with predicted outcomes.
Also, I seem to remember reading a while back that scientists had discovered particles or something previously unknown, that was traveling just ahead of light speed. Does that ring a bell with anyone?
I only mention it since the speed of light as the ultimate speed limit keeps being brought up. By all practical standards,(ie human space travel) it probably is, but that dosn't mean its the true absolute.
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