Our suits are repelling them, or we'd see nothing at visible wavelengths.
Naturally this only applies to light, that is, visible wavelengths.
They just add the visible wavelengths for show, so they can be seen from the ground.
The focal length for light at other visible wavelengths will be similar but not exactly equal to this.
The third observed in visible wavelengths, and was at the moment dark.
People also emit light, but at longer infrared wavelengths not visible to the human eye.
"And here's where we added visible wavelengths to the ultrasonics."
Other observations soon followed in both visible and radio wavelengths.
It looks like there is going to be a race to visible wavelengths, too.
So, it appears that we're only a small development in process technology away from having devices edge down into the visible wavelengths.