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When observers look out at the night sky, the number of stars with
Research Question
A question that guides the direction and focus of a scholarly investigation or study.
Policy Position
A stance or perspective held by an individual, organization, or government on a specific policy issue.
Testability
The capacity of comparisons to project consequences that have the potential to be shown to be false, inapplicable, or unacceptable.
Scientific Theories
Well-substantiated explanations of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment.
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Q199: Where do horizontal-branch stars get their energy?<br>A)
Q219: What is an emission nebula, also known