Mars Atmosphere And Magnetic Field

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Discussion Overview

The discussion centers on the challenges of terraforming Mars, specifically the creation and retention of an atmosphere and the generation of a magnetic field to protect the planet from solar and cosmic radiation. Participants explore theoretical approaches and the feasibility of these ideas within the context of Mars' physical characteristics.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • Some participants express skepticism about the feasibility of creating an atmosphere on Mars, citing its small size and limited gravity as significant barriers to retaining an atmosphere.
  • There is a concern that generating a magnetic field strong enough to protect Mars would require an impractical amount of power and resources.
  • One participant suggests that Mars may have had its own magnetic field in the past, and proposes the idea of "jump starting" Mars' core to potentially restore this field, which could help retain atmospheric particles.
  • Another participant mentions the possibility of using the Sun to create an induced magnetosphere, referencing a paper that discusses this concept in relation to Venus and suggesting it might also apply to Mars if an atmosphere is established.
  • Some participants note that the energy requirements for sustaining an artificial magnetic field would be enormous, raising doubts about the practicality of such a solution.

Areas of Agreement / Disagreement

Participants generally agree on the significant challenges posed by Mars' gravity and lack of a magnetic field for terraforming efforts. However, there are competing views on the feasibility of generating a magnetic field and the potential methods to achieve this, indicating that the discussion remains unresolved.

Contextual Notes

The discussion reflects uncertainties regarding the energy requirements for sustaining an artificial magnetic field and the assumptions about Mars' historical magnetic field. There are also unresolved questions about the practicality of proposed methods for generating a magnetic field.

mjacobsca
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So often I see shows on TV discussing the seemingly inevitable terraforming of Mars by humans. These shows generally talk about the challenges in creating an atmosphere (basically, heating up the frozen carbon dioxide to release greenhouse gases), thereafter releasing all of Mars' water, and eventually oxygen. However, from my reading I thought it was generally believed that Mars' small size and limited gravity made it very difficult for it to hold onto an atmosphere. If this is true, then why would we even waste time creating an atmosphere at all? Wouldn't it just be a waste of time?

Secondly, Mars has no magnetic field to protect it from solar flares and CME's and from cosmic rays and other sources of radiation from outer space. This point is always glossed over by popular science shows as a "minor" hurdle. However, it seems major to me. Therefore, my second question is whether it is possible to artificially generate a magnetic field big enough to protect an entire planet the size of Mars. If so, how might one generate such a field? Is it even possible?
 
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The atmosphere would take a long time to be lost. It would not happen in just a few years.

Generating a magnetic field of sufficient strength over such a large area is...difficult...to say the least. It would require a very large amount of power. I don't know how much though. Probably much more than we could feasibly achieve in the near future. And that's ignoring how you would generate it in the first place.
 
Pretty much we couldn't indefinitely fuel an artificially magnetic field that size. However they assume Mars had its own magnetic field at one point, so if we could "jump start" the core of Mars then it could sustain its own field. Also doing that would better hold ionized atmospheric particles (I think) such as ozone and whatnot.
 
d0wn10w said:
Pretty much we couldn't indefinitely fuel an artificially magnetic field that size. However they assume Mars had its own magnetic field at one point, so if we could "jump start" the core of Mars then it could sustain its own field. Also doing that would better hold ionized atmospheric particles (I think) such as ozone and whatnot.

While that may be plausible, it is far from feasible. The amount of energy required would be absolutely enormous.
 

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