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More massive stars have more weight to support, so these stars are more luminous.
Independent Variable
A variable in an experiment or model that is manipulated or changed to observe its effects on the dependent variable.
Procter & Gamble
An American multinational consumer goods corporation specializing in a wide range of personal health/consumer health, and hygiene products.
Old Spice
A brand of male grooming products known for its distinctive fragrance and creative advertising campaigns.
Extraneous Variable
A variable that influences the outcome of an experiment but is not the variable that is actually of interest. It's external and not the focus of the study.
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