nothing with mass can reach the speed of light

Nothing with mass can reach light speed because Lorentz factor γ → ∞ as v → c

Related concepts

Criticism of the theory of relativity

Michelson-Morley experiment null result

Gravitational lensing formalism

Light bends around massive objects due to spacetime curvature

Schwarzschild metric

Schwarzschild radius at r=2GM/c² marks the event horizon

Physics beyond the Standard Model

Could the universe be hiding clues about its deepest secrets?

Einstein's photoelectric explanation used Planck's E=hf to predict that higher frequency light ejects faster electrons

Einstein's photoelectric explanation used Planck's E=hf to predict faster electron ejection with higher frequency light

Special relativity

Albert Einstein's special relativity paper introduced time dilation

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