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Experimental test

Concept

A scientific model must answer to observations that can check its predictions.

Explanation or usage

A model proposes relationships and consequences that can be compared with measurements. A contradiction is a reason to re-examine the model, its assumptions, and the experimental setup. Agreement supports a model within the tested conditions rather than proving it universally true.

Common misunderstandings

Agreement with one experiment proves a theory in all possible conditions.

In Cosmos

General context reviewed · book attribution and sources pending

Compare a model’s predicted planetary positions with measured positions. Such observational tests can constrain a model without requiring a controlled experiment on a planet.

Linked books

Practice this item

A preferred circular model consistently misses reliable measurements, while an elliptical model predicts them better. What is the stronger scientific response? Two models fit older planetary observations. What is a strong way to compare their predictive performance?