Does theory of expansion effect gravity?

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Discussion Overview

The discussion centers around the relationship between the expansion of space and its potential effects on gravity, particularly regarding the Earth and atomic structures. Participants explore theoretical implications and the nature of gravitational binding in the context of cosmic expansion.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Exploratory

Main Points Raised

  • One participant suggests that if space expands, it could affect the Earth's diameter and consequently its gravitational force.
  • Another participant argues that the expansion of space does not impact objects bound by gravity, asserting that the Earth remains unaffected by cosmic expansion.
  • A participant questions the concept of expansion occurring on both the inner and outer sides of space.
  • There is a clarification that the universe does not have an 'outer' side by definition.
  • A later reply discusses how the expansion of space within atoms is negligible compared to the forces that hold them together, suggesting that atomic structures remain stable despite cosmic expansion.
  • One participant challenges the idea that the space inside atoms expands, stating that bound systems do not expand.

Areas of Agreement / Disagreement

Participants express differing views on whether the expansion of space affects gravity and atomic structures. There is no consensus, as some argue for the stability of bound systems while others propose potential effects of expansion.

Contextual Notes

Discussion includes assumptions about the nature of space and gravity, as well as the scale at which expansion becomes significant. The implications of these assumptions remain unresolved.

Shankar Dev
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If space will be expansion then it effect on Earth diameter. If Earth become narrow then how gravity force work ?
 
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The expansion of space does not affect objects which are bound together through gravity or one of the other fundamental forces of nature. The Earth is not affected by expansion.
 
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Yeah but If Space will expansion on both side inner side or outer side then ?
 
I'm sorry but I cannot understand you.
 
the universe has no 'outer' side by definition.
 
Thank you for your Kind reply.
 
I have not much knowledge about physics so can you help me sir ?
 
The space inside of all atoms expands, but it's to such a tiny degree that the forces of nature are far far more powerful and everything acts as it should. If space between an electron and proton expands a tiny tiny bit, it's less than the random motion of the electron anyway, that's why atoms don't fly apart due to expansion and it's the same for larger objects too. If the space inside the Earth expands by a billionth of a micrometer, gravity will keep everything in place. The expansion of space is minuscule, it presents itself only over massive distances. Here is a thought experiment you can do. Imagine a meter stick in your hand. Now imagine a magic force that caused it to expand 5%. It's now 1.05 meters long, a significant amount, but look at each millimeter mark by itself. It's 1.05mm now, not really that big of a deal. Now extrapolate, if the universe expands by light years as a whole, the amount we'd notice it within the tiny little speck that's planet Earth is next to nothing. Everything moves orders of magnitudes faster than the expansion of space except for at the most massive scales.
 
newjerseyrunner said:
The space inside of all atoms expands,

No, it doesn't. Atoms are bound systems. Bound systems do not expand.
 
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