Abstract— Space is dark because the photons released from sun have lost energy and became cold photons during their passage towards earth. Because photons do not have energy in space, so space is cold. When photons reach atmosphere, it hit suspended particles and get annihilated. Thus these photons produce energy and light is seen. A definite quantum of energy must hit retina of eye to detect light which is absent in space. This article explains the phenomenon assuming dual nature of light. Retina can see the particular wavelengths of light ranging from 380nm to 780nm.
Keywords— photon, space, energy, wavelength.
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