When will the CMB become red-shifted to the point where it is no longer detectable?

The Cosmic Microwave Background Radiation is constantly being red-shifted due to the expansion of space. or:The Cosmic Microwave Background Radiation

The Cosmic Microwave Background Radiation is constantly being red-shifted due to the expansion of space.

or:The Cosmic Microwave Background Radiation is constantly being red-shifted due to the expansion of space.

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