Discussion Overview
The discussion revolves around the perceived angular size of galaxies located 7 billion light-years away, particularly in the context of the expansion of the universe. Participants explore how this expansion might influence the angular size observed from Earth, incorporating mathematical reasoning and concepts related to redshift.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
- Mathematical reasoning
Main Points Raised
- One participant initially proposes that a galaxy 7 billion light-years away would appear twice the expected angular size due to the universe's expansion, based on their mathematical calculations.
- Another participant challenges this view, stating that while the distance between galaxies is expanding, the galaxies themselves are not, suggesting that the perceived size is determined by their actual size and distance.
- A subsequent post corrects the initial claim, acknowledging a miscalculation and clarifying that the question pertains to how the universe's expansion affects the perceived angular size of the galaxy.
- Another participant suggests that the expansion of space within galaxies may not result in a noticeable difference in angular size for distant galaxies.
- One participant introduces the concept of the 'turn over' in the angular size versus redshift relation, providing specific examples of how apparent angular size changes with redshift, including calculations for different distances.
- A later reply comments on the nature of scientific discourse, contrasting the clarity of scientific facts with political manipulation.
Areas of Agreement / Disagreement
Participants express differing views on how the expansion of the universe affects the perceived angular size of galaxies. There is no consensus on the implications of this expansion, and multiple competing perspectives remain throughout the discussion.
Contextual Notes
Participants reference mathematical calculations and concepts such as redshift without fully resolving the implications of these calculations or the assumptions involved in their reasoning.