Glossarbegriffe: Galaxie

Description: Eine Galaxie ist eine Ansammlung aus Sternen und anderen Bestandteilen wie Dunkler Materie, Gas und Staub, die durch die Schwerkraft zusammengehalten wird. Die Entfernung zwischen zwei benachbarten Galaxien beträgt üblicherweise Hunderttausende von Lichtjahren. Galaxien gibt es in verschiedenen Formen und Größen. Die kleinsten Galaxien können nur einige Tausend Sterne enthalten, während es in den größten Galaxien mehrere Billionen Sterne geben kann. Unsere Heimatgalaxie, die Milchstraße, wird auch als "Galaxis" bezeichnet. In ihr befinden sich ungefähr 100 bis 400 Milliarden Sterne.

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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

The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".

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Hubble Ultra Deep Field

Bildunterschriften: This awe-inspiring image referred to as the Hubble Ultra-Deep Field (HUDF), was obtained using the Hubble Space Telescope (HST), by combining 800 exposures from 400 orbits of the HST, which equates to 11.3 days of total exposure time. The image shows nearly 10,000 galaxies and was taken in the direction of a patch of sky with the least amount of stars from the Milky Way galaxy in the field of view. The region of sky that the HST observed corresponds to 1/10 the angular size of the Full Moon, which is roughly equal to approximately a 1 millimeter-sized object placed 1 meter away. Every object in the image, except for the bright points with the crosshairs, are galaxies. As a consequence of the speed of light being a constant in a vacuum, the more distant an object, the further back in time we are observing. Therefore, the light from some of the galaxies in the HUDF image is from when the Universe as only a few hundred million years old. The HUDF image takes us through on a journey through space, and also in time.
Bildnachweis: NASA, ESA, and S. Beckwith (STScI) and the HUDF Team credit link

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

Two spiral galaxies embracing in their early stages of merger with distortions on the smaller galaxy visible

Spiral Galaxy Merger

Bildunterschriften: This image shows two interacting spiral galaxies located approximately 150 million light-years away. Two spiral galaxies are involved in this dance, creating visible distortions in their spiral arms due to the gravitational pull. What is starting as an embrace in this picture, will end in the merger of those two galaxies into one, most likely elliptical, galaxy.
Bildnachweis: ESO credit link

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

This galaxy has a large bulge surrounded by a ring of dust creating an image similar to the mexican hat with the same name

Sombrero galaxy

Bildunterschriften: This prominent galaxy M 104 is often called the Sombrero galaxy due to its resemblance to the Mexican hat. This look is created by the thin disk oriented nearly edge-on, which appears illuminated by the dominant bulge. Both, the disk and bulge contain stars, but the stars in the bulge tend to be older, while the disk also harbors large amounts of dust and gas creating shadows. M 104 is located in the constellation Virgo approximately 50 light-years away. While some of the dots visible in the picture are foreground stars and others background galaxies, the majority are actually globular clusters, dense massive clusters of stars, associated with the Sombrero Galaxy.
Bildnachweis: ESO/P. Barthel credit link

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

Related Activities

Glitter Your Milky Way

astroEDU educational activity (links to astroEDU website)
Description: Explore the Milky Way and characteristics of galaxies using glitter drawing.

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

Tags: Art , Creativity , Hands-on , Handcraft
Age Ranges: 6-8 , 8-10
Education Level: Middle School , Primary
Areas of Learning: Fine Art focussed
Costs: Medium Cost
Group Size: Group
Skills: Communicating information

Coma Cluster of Galaxies

astroEDU educational activity (links to astroEDU website)
Description: The basics of galaxy classification, using Hubble Space Telescope images.

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

Tags: Coma Cluster
Age Ranges: 14-16 , 16-19 , 19+
Education Level: Secondary , University
Areas of Learning: Guided-discovery learning
Costs: Low Cost
Duration: 1 hour
Group Size: Group
Skills: Analysing and interpreting data , Communicating information , Constructing explanations , Planning and carrying out investigations

Living in the Milky Way

astroEDU educational activity (links to astroEDU website)
Description: Build a model of the Milky Way to discover what our galaxy contains.

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

Tags: Hands-on , Model
Age Ranges: 6-8 , 8-10
Education Level: Primary
Areas of Learning: Problem-solving , Social Research
Costs: Medium Cost
Duration: 1 hour 30 mins
Group Size: Group
Skills: Asking questions , Communicating information , Developing and using models

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