The Hubble Space Telescope is an optical and ultraviolet observatory, while the Spitzer Space Telescope, James Webb Space Telescope, and Infrared Telescope Facility are all infrared observatories.

Infrared observatories are designed to detect and study infrared radiation, which is emitted by a wide range of objects in the universe, including stars, planets, galaxies, and dust clouds.

Radio telescopes are used to detect and study radio waves, while refracting telescopes, reflecting telescopes, and catadioptric telescopes are all types of optical telescopes that can be used to detect and study infrared radiation.

Infrared radiation can penetrate dust and gas more easily than visible light, making infrared telescopes ideal for studying objects that are obscured by these materials.

Infrared telescopes are generally less sensitive than optical telescopes, meaning that they can detect fainter objects.

The Gran Telescopio Canarias is the largest infrared telescope in the world, with a primary mirror diameter of 10.4 meters.

Cerro Tololo Inter-American Observatory is primarily an optical observatory, while Kitt Peak National Observatory, Mauna Kea Observatories, and Paranal Observatory are all major infrared observatories.

The Spitzer Space Telescope was launched into space in 2003 and operated until 2020. It was the first space telescope to be dedicated to infrared astronomy.

The James Webb Space Telescope is scheduled to be launched into space in 2022. It will be the most powerful infrared telescope ever built.

The Infrared Telescope Facility is located on Mauna Kea in Hawaii. It is one of the largest and most powerful infrared telescopes in the world.

The Very Large Telescope is located in Chile. It is a set of four telescopes that can be used together to create a single image with very high resolution.

The Gran Telescopio Canarias is located in the Canary Islands. It is the largest infrared telescope in the world.

The Southern African Large Telescope is located in South Africa. It is one of the largest and most powerful optical telescopes in the world.

The Anglo-Australian Telescope is located in Australia. It is one of the largest and most powerful optical telescopes in the world.