Telescope
Telescope
A telescope (/ˈtɛlɪskoʊp/; from the Ancient Greek τῆλε, tele 'far' and σκοπεῖν, skopein 'to look or see'; τηλεσκόπος, teleskopos 'far-seeing') is an optical instrument using lenses, curved mirrors, or a combination of both to observe distant objects, or various devices used to observe distant objects by their emission, absorption, or reflection of electromagnetic radiation.
History
The first known practical telescopes were refracting telescopes invented in the Netherlands at the beginning of the 17th century, by using glass lenses. They were used for both terrestrial applications and astronomy.
Types of Telescopes
The word telescope now refers to a wide range of instruments detecting different regions of the electromagnetic spectrum, and in some cases other types of detectors.
1. Optical telescope, which is the subject of this article, a telescope that gathers and focuses light mainly from the visible part of the electromagnetic spectrum.
2. Radio telescope, a telescope that receives radio waves from space.
3. X-ray telescope, a telescope that is designed to observe remote objects in the X-ray spectrum.
4. Infrared telescope, a telescope that uses infrared light to detect celestial bodies.
5. Ultraviolet telescope, a telescope that observes light in the ultraviolet part of the electromagnetic spectrum.
6. Gamma-ray telescope, a telescope that looks for high-energy light called gamma rays.
See Also
References
External links
- Medical encyclopedia article on Telescope
- Wikipedia's article - Telescope
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