Definition: Aperture Telescope, also known as an Optical Infrared Telescope (OIR), is a type of telescope designed to observe faint, fainter stars in the night sky. Definition: An aperture telescope is a kind of optical instrument that uses large openings for collecting light. The name "aperture" comes from the opening's size, which determines how much light can be collected into a single exposure. Aperture telescopes are used for observing distant galaxies and more faint celestial objects in the night sky.
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