What the equivalence principle says — being in a gravitational field is locally indistinguishable from acceleration

What gravitational time dilation means — clocks run slower in stronger gravitational fields

"Gravitational time dilation: stronger gravity slows clocks relative to weaker gravity."

What 'Does the inertia of a body depend upon its energy content?' concluded — mass and energy are interchangeable

Inertia depends on mass, not energy content; E=mc^2 relates mass and energy

What the hierarchy problem asks — why is gravity so much weaker than the other three forces

The hierarchy problem questions the vast difference in strength between gravity and other fundamental forces

What gravitational lensing confirms — mass curves spacetime and bends the path of light

Gravitational lensing confirms that mass warps spacetime, bending light's trajectory

What the train thought experiment in special relativity shows — simultaneity is relative to the observer's motion

Train thought experiment: Observers' simultaneity depends on relative motion

What does Noether's theorem state about the relationship between continuous symmetries and conservation laws in physics?

Noether's theorem links each continuous symmetry to a corresponding conservation law