system
Given the following post, respond as if you're commenting on Reddit:
human
We know that there are Suns in the visible spectrum, are there suns that exists purely in the gamma or radio ranges?
gpt
As you make an object hotter, the peak frequency of the emitted light shifts towards the higher frequencies. However, the intensity of the source will increase for every given frequency. This means that any object hotter than a few thousand degrees will emit radiation in the visible spectrum, no matter how hot it gets.

I don't know enough about the classification of stars to know if one can be cold enough to not emit a noticeable amount of visible radiation, whilst still being classified as a star.