In the figure shown below, the upper spectrum is from hydrogen at rest in a laboratory, and the lower spectrum is from a galaxy. How far away is this galaxy? 
Definitions:
Logic
A systematic method of reasoning that aims to deduce valid conclusions from premises.
Good-looking Speaker
A speaker or presenter who is aesthetically pleasing or attractive in appearance.
Cognitive Dissonance
A psychological phenomenon that occurs when an individual holds two or more contradictory beliefs, ideas, or values at the same time, leading to psychological stress.
Behavior
is the range of actions and mannerisms made by individuals, organisms, systems, or artificial entities in conjunction with themselves or their environment.
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