Question

based on the spectrums in the figure, rank the four galaxies in order of the speed with which they are moving away from. text and image adapted from pearson education.

Explanation:

Step1: Understand redshift concept

The greater the redshift, the faster the galaxy is moving away. Redshift is indicated by the shift of spectral lines towards the red - end of the spectrum.

Step2: Analyze each galaxy's spectrum

Galaxy C has the most significant shift of spectral lines towards the red - end, followed by A, then D, and B has the least shift.

Answer:

1. C
2. A
3. D
4. B