Astronomy: The Universe Unit Test

Question

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Question
Blueshift is observed when(1 point)
Responses

a luminous object travels alongside an observer.
a luminous object travels alongside an observer.

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

a distant luminous object travels rapidly towards an observer.
a distant luminous object travels rapidly towards an observer.

a distant luminous object travels rapidly away from an observer.

Answer 1

Blueshift is observed when a distant luminous object travels rapidly towards an observer.

So, the correct response is:

a distant luminous object travels rapidly towards an observer.