What defines the surface of the Sun?

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SUMMARY

The discussion clarifies that the Sun does not possess a physical surface; instead, it has an apparent surface known as the photosphere. The concept of the photosphere is linked to the mean free path of photons, which is the distance a photon travels before being absorbed. Richard Feynman's idea suggests that the 'surface' is defined by the region where photons can escape the Sun without significant absorption. This understanding is crucial for comprehending solar physics and the behavior of light in stellar environments.

PREREQUISITES
  • Understanding of solar structure and layers, particularly the photosphere.
  • Familiarity with the concept of mean free path in physics.
  • Basic knowledge of photon behavior and absorption in stellar contexts.
  • Awareness of Richard Feynman's contributions to physics.
NEXT STEPS
  • Research the properties and characteristics of the photosphere in solar physics.
  • Study the concept of mean free path in relation to photon interactions.
  • Explore Richard Feynman's theories and explanations regarding light and matter.
  • Investigate the processes of light emission and absorption in stars.
USEFUL FOR

Astronomers, astrophysicists, students of physics, and anyone interested in the fundamental properties of the Sun and stellar light behavior.

Hornbein
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The sun has no surface, but it appears to have a surface. I may recall that Feynman said that the apparent diameter is equal to the mean free path of a photon. That could be, but I don't get the relationship. Any help?
 
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Perhaps what Feynman meant is that the 'surface' is defined as the region where the mean free path of photons becomes large enough for most of them to leave the Sun without being absorbed?
 

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