Why is there no atmosphere on moon

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    Atmosphere Moon
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Discussion Overview

The discussion centers on the reasons for the lack of atmosphere on the Moon, exploring factors such as gravitational pull, geological activity, and solar wind. It includes both theoretical and conceptual aspects of atmospheric retention and loss.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • Some participants suggest that the Moon's weaker gravitational pull allows atmospheric molecules to escape easily.
  • Others argue that the lack of geological activity on the Moon contributes to the inability to replenish any atmosphere.
  • One participant recalls that the Apollo missions may have altered the composition of the Moon's already negligible atmosphere.
  • Another participant mentions that Apollo suits vented gas to cool astronauts, indicating the absence of a significant atmosphere.
  • It is noted that the Moon lacks a magnetosphere, which some participants claim exposes gaseous atoms to solar wind, further contributing to atmospheric loss.
  • A participant asks for clarification on what solar wind is.
  • Another participant explains solar wind as a stream of sub-atomic particles from the Sun, which are mostly trapped by Earth's magnetic field.

Areas of Agreement / Disagreement

Participants generally agree on the factors contributing to the Moon's lack of atmosphere, such as weak gravity and lack of geological activity. However, there is no consensus on the extent of the impact of the Apollo missions or the role of solar wind.

Contextual Notes

Some claims depend on definitions of atmospheric retention and loss, and the discussion does not resolve the extent to which Apollo missions affected the Moon's atmosphere.

jontyjashan
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why is there no atmosphere on moon
 
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When compared to a planet like the Earth the moons gravitational pull is very much weaker and if any atmospheric molecules form the tendency is for them to escape.Also there is very little geological or other activity to replenish any atmosphere.
 
Last edited:


I can't recall where but I remember reading that because the moon's atmosphere is so ridiculously thin and negligible, the apollo missions significantly altered the composition of any atmosphere that already existed.
 


If I remember correctly, the apollo suits vented gas to cool the astronauts in the absence of atmosphere.
 


Dadface said:
When compared to a planet like the Earth the moons gravitational pull is very much weaker and if any atmospheric molecules form the tendency is for them to escape.Also there is very little geological or other activity to replenish any atmosphere.
Additionally, lacking a magnetosphere, gaseous atoms are not protected from the solar wind blasting them into the solar system.
 


What is solar wind?
 


Sidnv said:
What is solar wind?
A stream of sub-atomic particles (mostly protons) from the sun that stream out through the solar system.
On Earth the are mostly trapped by the magnetic field, some of them get through to the upper atmosphere at the north and south poles to give you the Norther Lights.
 

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