How does cosmological redshift affect light from the most ancient and distant sources?
Answer
The light's wavelength is stretched so severely that it moves outside the visible human range, into infrared or microwave radiation.
The greater the distance an object is, the faster it appears to recede due to cosmic expansion, resulting in a proportionally greater cosmological redshift. For the most ancient and distant sources, this stretching effect is extreme. Light that began its journey as visible light has its wavelength dramatically increased, causing it to fall far outside the narrow band visible to the human eye, transforming into longer wavelengths like infrared light or, for the very farthest objects, microwave radiation.
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