Physics for IGCSE & O level - The Earth In Space (Section 12 - No. 45)
What is the significance of red shift in light from distant galaxies?
It indicates the galaxies are moving towards us.
It indicates the galaxies are moving away from us.
It indicates the galaxies are stationary.
It indicates the galaxies are very bright.
Explicació
Red shift is caused by the Doppler effect, meaning that the galaxies are moving away.