Actually this not how it work. If they is reflect wavelengths invisible to hoomins eyes then they will just appears dark that is all. That is no make em inveesible.
And there is no meanings to saying “aliens is exist on spectrum” which is absurd. Everytheengs is exist in space. Notheeng can “exist on spectrum” because spectrum is just the light or electromagneteec energy itself that is split up by a grating or prism or any such device. It not a medium on which creatures is exist. Creatures is no exist inside light or spectrum.
Actually this not how it work. If they is reflect wavelengths invisible to hoomins eyes then they will just appears dark that is all. That is no make em inveesible.
And there is no meanings to saying “aliens is exist on spectrum” which is absurd. Everytheengs is exist in space. Notheeng can “exist on spectrum” because spectrum is just the light or electromagneteec energy itself that is split up by a grating or prism or any such device. It not a medium on which creatures is exist. Creatures is no exist inside light or spectrum.