Astronomy: The Universe Online Practice

Question

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Question
Redshift is observed when:(1 point)
Responses

a luminous object is stationary relative to an observer.
a luminous object is stationary relative to an observer.

a distant luminous object travels rapidly away from an observer.
a distant luminous object travels rapidly away from an observer.

a luminous object is traveling alongside an observer.
a luminous object is traveling alongside an observer.

a distant luminous object travels rapidly towards an observer

Answer 1

The correct response is:

a distant luminous object travels rapidly away from an observer.

Redshift occurs when the wavelength of light from an object is stretched, which typically happens when the object is moving away from the observer.