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A telescope that uses as its primary optical element a lens. Binoculars are a type of refractor. In general, refractors are much more expensive to build and buy than are ...

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Astronomy; General astronomy

A telescope that uses as its primary optical element a mirror. Nearly all large telescopes in use today by amateur and professional astronomers are reflecting telescopes.

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Astronomy; General astronomy

In astronomy, the measurement of the light emitting from astronomical objects, generally in the visible or infrared bands, in which a specific or general wavelength band is ...

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Astronomy; General astronomy

The apparent displacement or the difference in apparent direction of an object as seen from two different points not on a straight line with the object (as from two different ...

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Astronomy; General astronomy

The path of one object about another (used here for an object orbiting the sun).

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Ipar/Tárgykör: Culture Kategória: Popular culture

Belo

Bela je boja visokog sjaja ali bez pigmenta. Tačnije sadrži sve boje elektromagnetskog spektra i takođe je zvana i ahromatskom bojom. Crno je odsustvo ...