| Abstract from DBPedia | A telescope is a device used to observe distant objects by their emission, absorption, or reflection of electromagnetic radiation. Originally meaning only an optical instrument using lenses, curved mirrors, or a combination of both to observe distant objects, the word telescope now refers to a wide range of instruments capable of detecting different regions of the electromagnetic spectrum, and in some cases other types of detectors. The first known practical telescopes were refracting telescopes with glass lenses and were invented in the Netherlands at the beginning of the 17th century. They were used for both terrestrial applications and astronomy. The reflecting telescope, which uses mirrors to collect and focus light, was invented within a few decades of the first refracting telescope. In the 20th century, many new types of telescopes were invented, including radio telescopes in the 1930s and infrared telescopes in the 1960s.望遠鏡（ぼうえんきょう、英: telescope）とは、光学機器の一種で、遠くにある対象物をより近くにあるかのように見せるために設計されたもの。複数のレンズの配置、または曲面鏡とレンズの配置を機器の内部に含んでおり、これによって、光線がまとめられ、焦点に集められることで、拡大された像（image）が得られる。古くは「遠眼鏡（とおめがね）」とも呼ばれた。 転じて、電波望遠鏡（英: radio telescope）の略語としても用いられる。 (Source: http://dbpedia.org/resource/Telescope) |
