Answer: photon

AnswerCrossword Clue
PHOTONQuantum of radiant energy.
photonquantum of electromagnetic radiation
photonan elementary particle
PHOTONSomething scientists make light of?
PHOTONParticle with zero mass
PHOTONBit of light
PHOTONLight particle
PHOTONBit of illumination
PHOTONMassless particle
PHOTONUnit of light intensity
PHOTONUnit of light.
PHOTONUnit of light
PHOTONQuantum of light energy.
PHOTONX-ray particle
PHOTONLight quantum
PHOTONParticle theorized by Einstein
PHOTONLight unit in physics
PHOTONQuantum of light
PHOTONParticle of light
PHOTONKind of torpedo in "Star Trek"
PHOTONUnit of brightness