Is Superman a peeping Tom? or Would x-ray vision be biologically reasonable?
Real x-ray vision, the ability to (at least) detect X-rays as a 'visible' light (or any other detection system) seems it would be very problematic. X-Rays are a high energy form of electromagnetic radiation and are very damaging to living tissue (at least on Earth).
So developing a sensor to detect it would suggest that the evolutionary process felt the need to detect them, maybe as a way to avoid them?
So what would cause a species to be able to detect x-rays and still live in a viable environment that wouldn't cook them to death?
Or might they have developed (like Superman) an X-ray transmitter for communication? Or a natural biological weapon?
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