Glossarbegriffe: Teleskop

Description: Ein Teleskop ist ein Gerät, das Photonen (des sichtbaren Lichts oder anderer Wellenlängen) von weit entfernten Objekten sammelt und so einem Beobachter Informationen (z. B. ein Bild) über diese Objekte liefert. Frühe Teleskope (ab Anfang des 17. Jahrhunderts) verwendeten Linsen als optische Elemente (siehe Fernrohr). Linsen für solche Teleskope können aber nicht beliebig groß hergestellt werden. Deshalb werden stattdessen Spiegel (siehe Spiegelteleskop) benutzt, um das Licht von lichtschwächeren Objekten mit größeren Teleskopen zu fokussieren. Deshalb sind die größten optischen Teleskope Spiegelteleskope. Im 20. Jahrhundert wurden Teleskope zur Untersuchung anderer Bereiche der elektromagnetischen Strahlung erfunden, sodass es heute Radioteleskope, Infrarotteleskope, Röntgenteleskope usw. gibt. Da die Himmelsquellen lichtschwach sind, bauen Astronomen in der Regel Teleskope mit großer Öffnung, um mehr Licht zu sammeln und eine größere Winkelauflösung zu erreichen.

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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher
The translation of this term and its definition is still awaiting approval

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Two astronomers view a lunar eclipse. Between them in the partly cloudy sky, a series of bright circles trace a curved path

The Eclipse Between Us, by Muhammad Rayhan, Indonesia

Bildunterschriften: Second place in the 2021 IAU OAE Astrophotography Contest, category Total lunar eclipse. Total lunar eclipses belong to the rather spectacular celestial events and can be observed easily with and without a telescope. Here we see the stages of the total lunar eclipse of 31.1.2018 photographed in Indonesia: starting with the entry of the full moon disk into Earth's round umbra, the totality as Blood Moon, and the beginning of the Moon's exit from Earth's umbra until moonset.
Bildnachweis: Muhammad Rayhan/IAU OAE

License: CC-BY-4.0 Creative Commons Namensnennung 4.0 International (CC BY 4.0) icons

A telescope points to the sky where the Milky Way sits with mottled dark and light patches.

Learning Nights

Bildunterschriften: Beneath the sprawling expanse of the night sky over Colombia's Tatacoa Desert, a telescope finds its alignment with the majestic galactic core, while a smartphone captures this cosmic encounter. This snapshot, taken on 9 June 2023 during an astronomy camp, epitomises the accessible beauty of celestial marvels. It showcases the mesmerising grandeur of the night sky, inviting both the casual stargazer and the passionate astronomer alike. The splendour of the Milky Way, elegantly captured through a mobile device, seamlessly bridges the gap between sophisticated equipment and the pure, profound joy of observing the stars.
Bildnachweis: Juan Pablo Botero Londoño/IAU OAE (CC BY 4.0)

License: CC-BY-4.0 Creative Commons Namensnennung 4.0 International (CC BY 4.0) icons

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