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Question
question 1 - 2
the red shift in light from stars located in very distant galaxies suggests that these stars are -
- decreasing in temperature
- increasing in temperature
- moving toward the milky way
- moving away from the milky way
The red - shift in light from stars is related to the Doppler effect. When a star (or any object emitting waves) moves away from an observer, the wavelength of the light (or other waves) it emits is stretched. In the case of visible light, this stretching causes the light to shift towards the red end of the spectrum (longer wavelengths). This is known as the red - shift.
If a star were moving towards the Milky Way (our galaxy), we would observe a blue - shift (shorter wavelengths). Temperature changes of the star do not cause a red - shift. The red - shift is primarily a result of the relative motion of the star with respect to us (the observer in the Milky Way).
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moving away from the Milky Way