Physics for IGCSE & O level - The Earth In Space (Section 7 - No. 34)
What is the primary means of identifying the expansion of the universe?
Observing the movement of individual stars.
Measuring the distance between planets.
Detecting the redshift of light from distant galaxies.
Studying the chemical composition of nebulae.
Explanation
The redshift of light from distant galaxies is a primary indicator of the expansion.
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