Are galaxy orbiting around something?

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  • Thread starter Thread starter 13lackJesus
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Discussion Overview

The discussion revolves around the nature of galaxy orbits, specifically whether galaxies orbit solely around each other or if there are other factors involved. The scope includes theoretical considerations and observational evidence related to galaxy dynamics and dark matter.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant questions if galaxies orbit only around each other, suggesting a need for further exploration of the topic.
  • Another participant expresses a belief that galaxies must orbit something else, implying a lack of clarity on the matter.
  • A different viewpoint highlights that galaxies appear to orbit each other at velocities that cannot be accounted for by visible matter alone, suggesting the influence of dark matter.
  • Observational evidence, such as the detection of hydrogen and helium gas in the centers of galaxy orbits, is mentioned as being consistent with dark matter's gravitational effects.
  • A source is cited that discusses these concepts in the context of a lecture on the expanding universe.

Areas of Agreement / Disagreement

Participants express differing views on whether galaxies orbit solely around each other or if other factors, such as dark matter, play a significant role. The discussion remains unresolved with multiple competing perspectives.

Contextual Notes

Some claims depend on the interpretation of observational data and the definitions of gravitational influences, which may not be fully agreed upon among participants.

13lackJesus
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I know some galaxy orbite around other galaxy but are they orbiting only around each other?
 
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Yes, what else would they orbit?
 
Galaxies can be seen orbiting each other 'too quickly' to be explained by the matter the systems contain, another strong statement for the existence of dark matter. Hydrogen and helium gas has been detected/imaged with radio (X-ray?) telescopes in the center of the orbits at density and temperature being explained by the gravitation of the dark matter.

Want to cite source - believe it was during UC Irvine video lecture on Expanding Universe - James Bullock
www.youtube.com/watch?v=bAHBGtCX3cU
 

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