"To settle the science" means to find a definite and agreed upon answer to a scientific question or problem by conducting thorough and conclusive research and experiments. Full definition
Really, we have settled the science in less than 20 years on perhaps the most complex system we have ever tried to understand? (climate-skeptic.com)
In the absence of settled science on the matter, lets keep plugging in and driving plug - in hybrids, whether diesel or gas until something better is developed. (hybridcars.com)
Clearly distinguish settled science from the details on which scientists frequently focus their attention. (rabett.blogspot.ru)