What observable phenomenon suggests gravity is the currently prevailing large-scale force organizing a region of gas and dust?
Answer
A net inward velocity confirmed by blueshifts
When studying the dynamics of a nebula, spectral analysis can reveal the bulk movement of material. A net inward velocity, which is often confirmed by observing blueshifts (indicating material moving toward the observer), is direct evidence that gravity is successfully overcoming opposing pressures and organizing that specific section of gas and dust toward a central point of concentration, even if an actual star has not yet formed.
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