Is the Moon there when nobody looks at it?

  • Thread starter Thread starter RonLevy
  • Start date Start date
  • Tags Tags
    Moon
Click For Summary

Discussion Overview

This discussion explores the philosophical and quantum mechanical implications of whether the Moon exists when it is not being observed. Participants delve into the relationship between observation and reality, referencing concepts from quantum mechanics, including Bell's Theorem and the Copenhagen interpretation, while also questioning the nature of existence and measurement in both quantum and macroscopic contexts.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Exploratory

Main Points Raised

  • Some participants inquire about the specific mathematics or theories that suggest the Moon does not exist when unobserved, referencing Einstein's views and related literature.
  • Questions arise regarding what constitutes "looking," including scenarios involving video cameras and digital images, and whether these forms of observation affect existence.
  • One participant asserts that the Moon exists independently of observation, stating that quantum mechanics does not imply that existence is contingent on being looked at.
  • Another participant challenges the notion of independent particle attributes, arguing that the act of observation alters reality, even retroactively.
  • Concerns are raised about scaling quantum principles to macroscopic objects, questioning if the Moon, being composed of fundamental particles, follows the same rules as quantum entities.
  • Discussion includes the idea that macroscopic objects may have definite positions independent of measurement, contrasting with the behavior of fundamental particles.
  • Some participants speculate on the potential effects of collective observation on physical phenomena, such as tidal actions influenced by the Moon's gravity.

Areas of Agreement / Disagreement

Participants express a range of views, with no consensus reached. Some argue for the Moon's independent existence, while others maintain that observation plays a critical role in defining reality. The discussion remains unresolved regarding the implications of quantum mechanics on macroscopic existence.

Contextual Notes

Participants reference various interpretations of quantum mechanics, including the Copenhagen interpretation and Bell's Theorem, but do not reach a definitive conclusion on how these theories apply to the question of the Moon's existence. The discussion highlights the complexity of applying quantum principles to macroscopic objects.

  • #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
 
Physics news on Phys.org
  • #62
I did a google search and I found this article
http://www.ruf.rice.edu/~hpu/Phys311_source/mermin_moon.pdf
 
Last edited by a moderator:

Similar threads

  • · Replies 10 ·
Replies
10
Views
5K
  • · Replies 21 ·
Replies
21
Views
5K
  • · Replies 13 ·
Replies
13
Views
3K
Replies
65
Views
4K
  • · Replies 13 ·
Replies
13
Views
3K
  • · Replies 82 ·
3
Replies
82
Views
20K
  • · Replies 7 ·
Replies
7
Views
3K
  • · Replies 147 ·
5
Replies
147
Views
11K
  • · Replies 32 ·
2
Replies
32
Views
2K
  • · Replies 114 ·
4
Replies
114
Views
6K