What is meant by the terms red-shift and blue-shift?
1 Answer
Apr 20, 2018
It is referring to how light waves compress and expand distorting their colour (frequency) as they move towards or away from the viewer.
Explanation:
Red shift occurs when the light source is moving away from the observer. Blue shift occurs when the light source is moving towards the observer. This effect can be seen when looking at stars distant stars.
