refractor shape
11Refracting telescope — A refracting or refractor telescope is a dioptric telescope that uses a lens as its objective to form an image. The refracting telescope design was originally used in spy glasses and astronomical telescopes but is also used in other devices such… …
12Amateur telescope making — The field of amateur telescope making is considered an offshoot of the amateur astronomy community. Amateur telescope makers (sometimes called ATMs), as their name implies, are not paid professionals. They build their telescopes for the enjoyment …
13Cosmic distance ladder — * Light green boxes: Technique applicable to star forming galaxies. * Light blue boxes: Technique applicable to Population II galaxies. * Light Purple boxes: Geometric distance technique. * Light Red box: The planetary nebula luminosity function… …
14Otto Wilhelm von Struve — Not to be confused with his grandson Otto Struve (1897–1963); see Struve family Otto Wilhelm von Struve Otto Wilhelm von Struve (May 7, 1819 (Julian calendar: April 25) – April 14, 1905) was a Russian astronomer. In Russian, his name is normally… …
15Meade Instruments — For other uses, see Meade (disambiguation). Meade Instruments Corporation Type Public (NASDAQ: MEAD) Founded 1972 …
16Patrick Young Alexander — (28 March 1867 7 July 1943) was a British aeronautical pioneer fascinated by the prospect of heavier than air flight. He was an enthusiastic balloonist and he was also particularly active in meteorology. He performed many metrological and… …
17Amalthea (moon) — Infobox Planet name = Amalthea caption = Galileo images of Amalthea bgcolour = #a0ffa0 discovery = yes discoverer = E.E. Barnard discovered = September 9, 1892 mean orbit radius = 181 365.84 ± 0.02 km (2.54 RJ)cite… …
18Reflecting telescope — 24 inch convertible Newtonian/Cassegrain reflecting telescope on display at the Franklin Institute. A reflecting telescope (also called a reflector) is an optical telescope which uses a single or combination of curved mirrors that reflect light… …
19Observational astronomy — Mayall telescope at Kitt Peak National Observatory Observational astronomy is a division of the astronomical science that is concerned with getting data, in contrast with theoretical astrophysics which is mainly concerned with finding out the… …
20Newtonian telescope — The Newtonian telescope is a type of reflecting telescope invented by the British scientist Sir Isaac Newton (1642–1727), using a concave primary mirror and a flat diagonal secondary mirror. Newton’s first reflecting telescope was completed in… …
