Can we arrive at definite scientific conclusions?
I think only in the areas that we can physically reach today can we reach to scientific facts. Wherever we can get to whether it is in the deep depths of the ocean or in outer space by rocket and sattelite can we come to some understanding of real scientific facts based on our current capabilities.
So whether it is proving scientifically what was earlier in time like the theory of evolution or what is in deep space where it is beyond our capabilities to reach by rocket or sattelite, or what will be in the future like predicting global warming is based in theory and the scientific community needs to come clean and admit that their so called facts are theories. They have no right to tout theories as facts.