A star’s light is shifted to the red part of the light spectrum.

What does this mean about the length of light waves and movement of the star?

A.
The wavelengths are getting longer, meaning the star is moving toward the observer.

B.
The wavelengths are getting shorter, meaning the star is moving away from the observer.

C.
The wavelengths are getting shorter, meaning the star is moving toward the observer.

D.
The wavelengths are getting longer, meaning the star is moving away from the observer.

Question

A star’s light is shifted to the red part of the light spectrum.
 
What does this mean about the length of light waves and movement of the star?
 
 A.
The wavelengths are getting longer, meaning the star is moving toward the observer.
 
 B.
The wavelengths are getting shorter, meaning the star is moving away from the observer.
 
 C.
The wavelengths are getting shorter, meaning the star is moving toward the observer.
 
 D.
The wavelengths are getting longer, meaning the star is moving away from the observer.

anonymous · Answer

When the wavelength increases (gets longer), the object is moving away. This will make the object more reddish.
When the wavelength decreases (gets shorter), the object is coming closer. This will make the object look more blueish.

anonymous · Answer

so what is the answer is it a or d ? :)

anonymous · Answer

D

anonymous · Answer

thanks i just have one more question

anonymous · Answer

okay tag me