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Absolute proof either way doesn't exist. But neither does any possible proof exist for the skeptic.
Saw this question posed on another forum and thought it would also bring some healthy debate here as well.
We can see an apple because it reflects red light. A frequency of light we can see. Why is there no object on earth that only reflects a light frequency that we cannot see. Like UV. Let us say that there is an object that only reflects UV or IR frequencies. These objects are real physical objects but cannot be seen by the human eye. Since the earth is supposed to be random, these object should actually exist. Why don't they?
Not everyone has figured that out yet, like the OP and this kid:
glass is kinda hard to see
so is any one atom of anything...
at least I can't see them without my glasses onedit on 22-2-2014 by Danbones because: (no reason given)
That's a good one.
Yes, in some way (and under some circumstances) glass cannot be seen. But a glass surface can certainly reflect heat (IR).
Simple...would kind of fit the criterion.