Is the Moon there when nobody looks at it?

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SUMMARY

The discussion centers around the philosophical and scientific implications of whether the Moon exists when not observed, referencing Einstein's skepticism and Bell's Theorem. Participants highlight N. David Mermin's paper, "Is the moon there when nobody looks? Reality and the quantum theory" (1985), which explores the intersection of quantum mechanics and reality. The conversation emphasizes that while quantum mechanics suggests observation affects reality, macroscopic objects like the Moon maintain existence independent of observation, as supported by the Heisenberg Uncertainty Principle and Bell's Theorem.

PREREQUISITES
  • Understanding of Quantum Mechanics principles
  • Familiarity with Bell's Theorem and its implications
  • Knowledge of the Heisenberg Uncertainty Principle
  • Basic grasp of philosophical implications of observation in physics
NEXT STEPS
  • Read N. David Mermin's paper "Is the moon there when nobody looks? Reality and the quantum theory" (1985)
  • Study Bell's Theorem and its experimental validations
  • Explore the Heisenberg Uncertainty Principle in detail
  • Investigate the Copenhagen Interpretation of quantum mechanics
USEFUL FOR

Students of physics, philosophers of science, and anyone interested in the implications of quantum mechanics on reality and observation.

  • #61
I used the moon as an example to illustrate the same question in the Quantum Physics Section of PF.

quantumcarl said:
If no human has observed the moon or been able to calculate its existence through studying its physical effects... does the moon exist under the terms and formulations of quantum mechanics?

this got quite a few replies from some excellent sources on PF not unlike this thread!

Here's the thread:
https://www.physicsforums.com/showthread.php?t=106188
 
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  • #62
I did a google search and I found this article
http://www.ruf.rice.edu/~hpu/Phys311_source/mermin_moon.pdf
 
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