Discussion Overview
The discussion revolves around the behavior of supermassive black holes (SMBHs) at the centers of galaxies, particularly regarding their consumption of surrounding matter, the implications for galaxy structure, and the nature of black holes in relation to dark matter and dark energy. Participants explore theoretical aspects, potential limits on black hole growth, and the dynamics of matter in galactic systems.
Discussion Character
- Exploratory
- Debate/contested
- Conceptual clarification
Main Points Raised
- One participant questions whether a black hole can consume an entire galaxy over time and asks about the existence of size limits for black holes and their interaction with dark matter and dark energy.
- Another participant suggests that while mass in a galaxy may eventually fall into the black hole, this process occurs over an incredibly long timescale, and black holes may eventually evaporate due to Hawking radiation.
- A different participant clarifies that supermassive black holes do not continuously consume material and that their presence does not destabilize the orbits of surrounding stars and planets. They emphasize that black holes are not like vacuum cleaners and that the orbits of celestial bodies would remain unchanged if a star were replaced by a black hole of equal mass.
- This participant also states that there is no size limit for black holes, noting that they can grow indefinitely and can consume dark matter, but not dark energy, which does not contribute to mass or gravity.
- A later reply expresses gratitude for the clarification regarding the stability of systems with black holes, indicating a better understanding of the topic.
Areas of Agreement / Disagreement
Participants express differing views on the consumption of galaxies by black holes, the nature of black hole growth, and the effects of black holes on their surrounding systems. There is no consensus on the implications of these factors, and the discussion remains unresolved.
Contextual Notes
Participants acknowledge the complexity of black hole interactions with various forms of matter and energy, highlighting uncertainties regarding the long-term dynamics of galaxies and the role of dark energy.