In accordance with the law of conservation of momentum,

it is shown that the photon at when propagated in outer space, it

loses its energy to radiation gravitational waves. With the complete

loss of its energy, the photon disappears into the cosmic space. The

loss of electromagnetic energy per linear meter is shown.                                                                 In accordance with the law of conservation of momentum,

it is shown that the photon at when propagated in outer space, it

loses its energy to radiation gravitational waves. With the complete

loss of its energy, the photon disappears into the cosmic space. The

loss of electromagnetic energy per linear meter is shown.