their are so many questions and so few answers, is the universe open closed? is it infinite or finite? does dark energy, dark matter exist? What are the constants that govern our universe? I have read many papers that tweek known parameters, or invoke new theories, most have no testability without more new data, or may be impossible to disprove. So my question is what tests are needed to qualify a theory? How do you select which theory is correct? what tests are needed to aid a selection? can we ever have a perfect model of our universe?