How Does Space Expand? Understanding Universe Expansion

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SUMMARY

The universe is expanding, but this expansion does not involve the creation of matter or mass. Existing matter is simply moving further apart. While mass can be created or destroyed through processes such as particle decay and matter-antimatter annihilation, the fundamental mechanics of space expansion remain poorly understood. Current scientific consensus acknowledges that mass is a form of energy, which can be converted under specific conditions.

PREREQUISITES
  • Understanding of general relativity and its implications on space-time.
  • Familiarity with the concepts of mass-energy equivalence (E=mc²).
  • Knowledge of particle physics, particularly regarding particle decay and annihilation.
  • Basic grasp of cosmology and the observable universe.
NEXT STEPS
  • Research the implications of general relativity on cosmic expansion.
  • Explore the principles of mass-energy equivalence and its applications in modern physics.
  • Study particle physics, focusing on decay processes and annihilation events.
  • Investigate current theories in cosmology regarding the mechanics of space expansion.
USEFUL FOR

Astronomers, physicists, and students of cosmology seeking to deepen their understanding of the universe's expansion and the nature of mass and energy.

dirty dan
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how can the universe be expanding if matter nor mass can be created?
 
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dirty dan said:
how can the universe be expanding if matter nor mass can be created?
Because the expansion doesn't involve creating matter. It's just existing matter getting further apart.

That said, matter/mass can certainly be created or destroyed. Mass is a form of energy, and other forms of energy can be converted to mass under the right conditions. When heavy particles decay or matter and anti-matter meet and are annihilated, mass is also destroyed.
 
The truth, there is no satisfying explanation. They really don't understand the mechanics behind how space expands... :cry:
 

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