What the minimum mass for a habitable exoplanet or moon?

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Discussion Overview

The discussion revolves around the minimum mass required for an exoplanet or moon to maintain habitability, particularly in relation to retaining a sufficient atmosphere and supporting liquid water. The scope includes theoretical considerations of planetary mass, atmospheric retention, and potential biosystems.

Discussion Character

  • Exploratory, Debate/contested, Conceptual clarification

Main Points Raised

  • Some participants propose that super Earths with masses between 2-10 times that of Earth can support thick atmospheres and plate tectonics, suggesting a minimum mass for habitability.
  • One participant estimates that a mass slightly over half of Earth's mass may be necessary to retain enough atmosphere and liquid water for a biosystem.
  • Another participant references an exoplanet, 5r7a4br-Xm7, which is significantly larger and more massive than Earth, theorizing that its high rotational rate might allow for normal life processes despite its strong gravity.
  • There is a critique of a metaphor involving fish and comprehension, with participants expressing that the analogy is flawed and absurd, questioning the validity of such comparisons in the context of discussing habitability.
  • A participant humorously notes their ongoing efforts to understand the metaphorical 'glub glub' language, indicating a light-hearted take on the previous critique.

Areas of Agreement / Disagreement

Participants express differing views on the minimum mass required for habitability, with no consensus reached on the exact figures or conditions necessary for sustaining life.

Contextual Notes

The discussion includes speculative elements regarding the conditions necessary for life and the implications of planetary mass, with some assumptions about atmospheric retention and biosystems remaining unresolved.

cosmicrock
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So I've read that super Earth's masses 2-10 can be habitable hold thick atmosphere and generate plate tectonics. So I am wondering the absolute minimum mass an exoplanet or moon can be to stay habitable in the liquid H2O zone? I guess these would be called subEarth's.
 
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It would probably take a little over 1/2 Earth mass to retain sufficient atmosphere and liquid water to support a biosystem.
 
Interesting question, considering the exoplanet 5r7a4br-Xm7 (Xavier-Levinson-7c), while approximately 40 times the diameter of Earth, and estimated to be 20~25 times more massive, shows strong evidence of supporting intelligent life. It's theorized the high rotational rate (approximately 32hr) offsets the strong gravitation enough to provide for what we could call "normal" life processes. Of course this data is being collected from Earth, and there is no way to know for certain if life exists on such a place.
 
The second quote concerning the fish is absurd. A fish cannot comprehend anything other than it's search for food. Even if it could comprehend 'water', there would be no way to detect if it were capable of comprehending such, as we have no process to communicate with fish. Therefore, the fish quote is ridiculous, and absurd.
 
Smashinz_1885 said:
The second quote concerning the fish is absurd. A fish cannot comprehend anything other than it's search for food. Even if it could comprehend 'water', there would be no way to detect if it were capable of comprehending such, as we have no process to communicate with fish. Therefore, the fish quote is ridiculous, and absurd.

That's his signature, it's in all his posts. Don't take it so seriously!
 
I'm still working on my 'glub glub' translation skills.
 

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