Determining the probability of intelligent life existing outside of our visible light spectrum, or whether we exist outside theirs, is highly speculative as it is based on our current understanding and limited knowledge of the universe. Here are a few considerations:
Existence of other forms of life: Life as we know it is based on carbon chemistry and requires certain conditions to thrive. However, it is possible that life could exist in forms that are radically different from what we are familiar with, using alternative chemistries or energy sources. It is challenging to assess the probability of such life forms since our understanding is limited to life as we currently know it.
Limited human perception: Our senses are tuned to a specific range of the electromagnetic spectrum, including visible light. There may be forms of life that exist outside our perception because they operate on different wavelengths or use other means of communication and interaction that are beyond our current detection capabilities.
Extremophiles and alien environments: On Earth, we have discovered extremophiles, organisms that can survive and thrive in extreme conditions such as high temperatures, pressure, acidity, or lack of light. This suggests that life may have the potential to adapt and exist in environments that are vastly different from what we consider habitable.
Considering the vastness of the universe, with billions of galaxies and countless star systems, it seems plausible that there could be forms of intelligent life existing beyond our visible light spectrum. However, without concrete evidence or a comprehensive understanding of life beyond our current knowledge, it is challenging to assign a specific probability to such occurrences. It remains a topic of scientific exploration and speculation.