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Ochsenfeld, Robert

Ohm, Georg Simon

Omega Point (Tipler)

One-electron universe

Onnes, Heike Kamerlingh

OPERA experiment

Optical aberration

Optical lens design

Optical path length

Optical telescope

Ornstein–Zernike equation

Ørsted, Hans Christian

Osheroff, Douglas Dean

Oskar Klein Memorial Lecture

Ostrogradsky instability

Otto Laporte Award

Physics Encyclopedia

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