Question

What happens to light waves from a star as the star moves toward Earth?

A.
They appear to shift toward blue.

B.
They appear to shift toward red.

C.
They appear to become mechanical waves.

D.
They appear to stop.

Answer 1

B. They appear to shift toward red

Answer 2

If a star is moving towards the earth, its light is shifted to higher frequencies on the color spectrum (towards the green/blue/violet/ultraviolet/x-ray/gamma-ray end of the spectrum). A higher frequency shift is called a "blue shift".

Step-by-step explanation:

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