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The Large Binocular Telescope at the Mount Graham International Observatory in Arizona uses two curved mirrors to gather light. An optical telescope gathers and focuses light mainly from the visible part of the electromagnetic spectrum, to create a magnified image for direct visual inspection, to make a photograph, or to collect data through electronic image sensors.
Telescopes can be classified by optical design or mechanical design/construction. Telescopes can also be classified by where they are placed, such as space telescopes. One major determining factor is type of light, or particle being observed including devices referred to as "telescopes" that do not form an image or use optics.
This list of space telescopes (astronomical space observatories) is grouped by major frequency ranges: gamma ray, x-ray, ultraviolet, visible, infrared, microwave, and radio. Telescopes that work in multiple frequency bands are included in all of the appropriate sections.
List of largest optical refracting telescopes; List of space telescopes; List of solar telescopes; List of telescope types; List of largest optical telescopes historically; List of largest optical telescopes in the 20th century; List of largest optical telescopes in the 19th century; List of largest optical telescopes in the 18th century
In its first batch of full-color images, the Euclid telescope captured a cosmic portrait that officials at the space agency called “a revolution for astronomy.” The image shows roughly 1,000 ...
Barlow lens: Optical element to increase the telescope's focal length and magnification, narrow the field of view and reduce coma distortion, providing opposite effects of a telecompressor. Astronomical filter: Used to select specific colors (or light frequencies) for astrophotography.
A diagram of the electromagnetic spectrum with the Earth's atmospheric transmittance (or opacity) and the types of telescopes used to image parts of the spectrum.. Visible-light astronomy encompasses a wide variety of astronomical observation via telescopes that are sensitive in the range of visible light (optical telescopes).
Telescope History Archived 2021-02-14 at the Wayback Machine, NASA Official Website, accessed 02/09/2019 History of the Telescope , accessed 02/09/2019 List of astronomical observatories and telescopes , Encyclopedia Britannica, 02/09/2019