Is EVERYTHING affected by gravity?

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SUMMARY

Everything observable in the universe possesses energy, which correlates to mass, and thus is influenced by gravity. This principle is grounded in the understanding that all mass, including total mass rather than just rest mass, interacts with gravitational forces. The 1919 Eddington experiment confirmed that photons, despite having no rest mass, are also affected by gravity. Viewing gravity as a curvature in space-time reinforces the notion that all entities within space-time are subject to gravitational effects, aligning with the equivalence principle.

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  • Understanding of general relativity
  • Familiarity with the equivalence principle
  • Knowledge of the Eddington experiment (1919)
  • Basic concepts of mass-energy equivalence
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  • Research the implications of general relativity on modern physics
  • Explore the equivalence principle in detail
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Generalizing somewhat on my other post, I have to wonder -- if everything observable has an energy associated with it, then it is a form of mass as well, right? And all mass is affected (and causes) gravity, right? (And I don't mean rest mass -- I mean total mass.)

Am I missing something stupid/obvious here?
 
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The answer is yes. In the case of photons this was confirmed by the 1919 Eddington experiment.
 
If one views gravity as a curvature in space-time then obviously everything which lives in space-time (i.e. everything) is affected by gravity. If this were not true, there would be a violation of the equivalence principle.
 

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