Photon spheres are regions in space where light orbits around a black hole.

Dual photon absorptiometries are commonly used in medical imaging.

Dual photon absorptiometry is a medical imaging technique used to measure bone density.

The last photon orbit of a black hole is the region where photons can orbit the black hole before falling into it.

The photonastic flowers opened wide in the morning sun.

The photographer developed the photonegative in the darkroom.

The photoneutrino is a fundamental particle in physics.

Photonuclear reactions are used in nuclear physics to study the properties of atomic nuclei.

Photoneutron is a type of nuclear reaction.

The photonuclear reaction is a key process in nuclear physics.