Astronomy   View all facts   Glossary   Help
physical object > natural object > particle > boson > carrier boson > photon > optical > orange
Next opticalred    Upoptical    Previous opticalgreen   

orange comparison table
Subject is a kind of has definition
opticalphotonElectromagnetic radiation with wavelengths of or close to those detectable by the eye.
orangeoptical 

Next opticalred    Upoptical    Previous opticalgreen