When the Universe was 379,000 years old, the radiation could travel into space. From that point in time the CMB started to be emitted in form of visible light. Am I correct? my question is: for how long the CMB was emitted? Or is it still emitted today? If the CMB was emitted for 10 million years, then it should only be available for us to receive for 10 million years, and not longer. For example if a red giant star is born today 1 billion light years away from us and it lives 1 million years, then we will start to see it after 1 billion years but only for 1 million years. After that million years, it won't be on our sky anymore. Where am I wrong?