It's arbitrary, but one answer is ...
infra-red, microwave, and radio.
It's detected by means of a camera that is sensitive to infra-red light. Visible light forms only a tiny portion of the electromagnetic spectrum.
Astronomers study as much of the spectrum of radiation as they can, and the visible spectrum is only a small segment of it.
Radiowaves Microwaves Infrared Visible Spectrum (light) Ultraviolet X-ray radiation Gamma Radiation
Visible light is a small part of the electromagnetic spectrum.
ultraviolet radiation
By definition, ultra-violet light is outside the visible spectrum of EM radiation. Thus it is defined as invisible.
It all depends upon where you place the boundaries of the infrared spectrum. The electromagnetic spectrum is a continuum and there is no exact boundary for any particular designation. If you define IR as that radiation below red which is invisible then Yes it is invisible.
Visible spectrum
Visible and invisible energy compose dark energy or radiation. Radiation is composed of both visible and invisible light or energy that expands or spreads as it moves away from its source.
The spectrum that our eye had receptor is visible and the invisible is just purely out of our receptor range.
The visible spectrum between red and violet.
It's detected by means of a camera that is sensitive to infra-red light. Visible light forms only a tiny portion of the electromagnetic spectrum.
The visible spectrum is one band within the full range of electromagnetic radiation.
Astronomers study as much of the spectrum of radiation as they can, and the visible spectrum is only a small segment of it.
radiation
Visible radiation (light): 380-760 nm (or 790-400THz)
Light is electromagnetic radiation, some visible and some not. The obvious visible spectrum is the one displayed in rainbows, which encompass the kind of light that we can see. One obvious invisible light is infrared radiation, which is basically heat. The visible spectrum ranges from 380 nm to 750 nm, in wavelength. Below the visible spectrum (less energetic) would be infrared, microwave, FM, AM, and so on. On the other side (more energetic) would be UV, X-ray, gamma-rays, etc.