Discussion Overview
The discussion centers on whether gravity compresses matter in planets, specifically examining the effects of gravitational compression on the density of planets made entirely of water ice. The scope includes theoretical considerations and hypothetical scenarios regarding planetary composition and density.
Discussion Character
- Exploratory
- Technical explanation
- Conceptual clarification
- Debate/contested
Main Points Raised
- Some participants propose that gravity does cause compression of matter in planets, using Jupiter as an example.
- Others question the relevance of Jupiter to other types of planets and suggest that more data is needed for a comprehensive understanding.
- A hypothetical scenario is presented comparing a 1,000 km diameter water ice planet to a 20,000 km diameter water ice planet, with uncertainty about their densities due to gravitational effects.
- One participant suggests that the density of the larger planet would likely be greater due to gravitational compression, but emphasizes the need for calculations involving pressure and phase diagrams of water under high pressure.
- Another participant notes that factors such as temperature and salinity also influence density, referencing ocean water as an analogy.
Areas of Agreement / Disagreement
Participants express differing views on the effects of gravity on density, with some agreeing that compression occurs in larger planets while others highlight the need for more specific data and calculations. The discussion remains unresolved regarding the exact impact of gravity on the density of hypothetical water ice planets.
Contextual Notes
Limitations include the lack of consensus on the necessary data for different planetary types and the dependence on specific conditions such as temperature and pressure for accurate density calculations.