The Spitzer Space Telescope, launched in 2003, was equipped
to observe in the infrared, at wavelengths of 3 to 180 micrometers
(3,000 to 180,000 nanometers).
The liquid helium that it carried, to cool its cryogenic detectors, was
exhausted sometime in 2009, so the band of wavelengths is probably
less now.
Your eyes can detect the visible light part of the electromagnetic spectrum, which ranges from approximately 400 to 700 nanometers in wavelength. This is why humans can see colors like red, orange, yellow, green, blue, and violet.
VIsual light
Humans can only see part of the electromagnetic spectrum because our eyes are sensitive to a limited range of wavelengths, known as visible light. The evolution of our visual system has adapted to detect these wavelengths, as they provide valuable information about our environment. Other animals may see different parts of the electromagnetic spectrum based on their specific visual adaptations.
Most of the light emitted by humans is in the infrared part of the electromagnetic spectrum.
X-rays are used to detect broken bones in medical imaging. X-ray imaging uses electromagnetic radiation with wavelengths shorter than visible light to create images of the inside of the body, including bones.
The visible spectrum
I suppose you mean the visible spectrum, only a small part of the entire electromagnetic spectrum. The visible spectrum is basically all of the colors the human eye can detect.
A telescope helps you to see objects in the distance better. The electromagnetic spectrum is a collection of all waves. Light is part of the electromagnetic spectrum albeit a very small part. X-rays, gamma rays, infra-red, ultra-violet, etc. are all members.
Your eyes can detect the visible light part of the electromagnetic spectrum, which ranges from approximately 400 to 700 nanometers in wavelength. This is why humans can see colors like red, orange, yellow, green, blue, and violet.
Telescopes can be made to see in almost any part of the electromagnetic spectrum: visible light, infrared light, ultraviolet light, X-rays, or radio waves. The largest telescopes are those for radio waves - in Arecibo there is one with a diameter of 300 meters. I am not sure whether it is the largest, though.
Camuy Puerto Rico on the southwestern part of the Island, minutes from the Arecibo radio telescope known as the Arecibo observatory controlled and ran by Cornell University. This section of the island is rich in limestone formations with many sink holes and caves. The Camuy caves are famous for their beauty and the presence of the Camuy River flowing through the cave.
An optical telescope focuses and concentrates visible light; radio telescopes focus and concentrate electromagnetic radiation (which means, "light") in the radio part of the spectrum.
No, a radio telescope is designed to detect radio waves, which have much longer wavelengths than visible light. Visible light cannot be studied using a radio telescope as it operates in a different part of the electromagnetic spectrum. To study visible light, astronomers typically use optical telescopes.
VIsual light
Yes, the invisible spectrum includes wavelengths beyond what our eyes can detect, such as ultraviolet and infrared light. These wavelengths do not correspond to the colors of the rainbow that we can see with our eyes.
Telescope eyepieces are important of any visual telescope. It is the main part of the telescope and is what determines how the object will look like through the telescope.
Visible light is a very narrow range of the electromagnetic spectrum. Even audible sound, at the very bottom, is part of this EM spectrum. Radio and other types of 'scopes are designed to 'see' these other ranges, often with surprising results. The space telescope employs more than visible light capabilities, as do many Earth and space-bound telescopes. Looking at Saturn in visible light is quite breath-taking, but in ultra-violet (UV) a remarkable geometric pattern is visible on one of its poles.