Multiple choice general knowledge science & technology

Galaxies are moving apart. which method tells us that two galaxies are moving away

  1. Red Shift

  2. Blue Shift

  3. Gravity change

  4. Orbit Deviation
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A Correct answer
Explanation

When galaxies move away from us, the light they emit is stretched to longer wavelengths, shifting toward the red end of the spectrum (redshift). This is a consequence of the Doppler effect applied to light. Blueshift indicates movement toward the observer, not away.

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