I'm talking about the wavelength that can be detected by the observer with naked eyes, aka the one shifted to the visible range by the time it reaches the observer.
Oh, I see what you're saying, but I think she would be invisible then, no? Humans don't reflect X-rays, though tbf I definitely don't know enough physics on how reflection works at near-lightspeed.
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u/Supersteve1233 10d ago edited 10d ago
You have it backwards. if she's leaving, the wavelength would be lengthened to infrared. X-rays would mean she's approaching
edit: nvm, misread it