Reporting in the New Journal of Physics, researchers at the University of Texas in Austin cloaked an 18-centimetre cylindrical tube from light in the microwave part of the energy spectrum.
Those hoping for a Harry Potter-style touch of wizardry would be disappointed. To the human eye, which can only perceive light in higher frequencies, no invisibility would have been seen.
But, say the researchers, the experiment is important proof of a principle that so-called plasmonic meta-materials can achieve a cloaking effect.
A warplane cloaked with such materials could achieve "super-stealth" status by becoming invisible in all directions to radar microwaves, said co-lead investigator Andrea Alu. Read more source
It brings to question if only a Small spectrum visible to the human eye then what else could there be out there we and organisations like SETI be missing? Ufos could simply shift their frequency and they could be right above us and we would have no idea!.