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You always need a control sample.
These are observational sciences, in which you collect data from whatever the universe offers you. You actually can't do an experiment in which you create a thousand stars with varying masses and elemental composition and see what happens to them over billions of years. What you can do is observe as many stars as possible, and sort them by mass and composition, and then look for patterns in the population that reflect how they age over time. This is just as valid a way of doing science as creating experiments, although it can be a bit more difficult to extract information from the data that nature provides.
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