Where does the energy from photons affected by the expansion of the universe go?
Since the expansion of space redshifts photons (making them less energized) where does the energy go?
How does a photon lose energy? Does light travel indefinitely in space? Why does light have energy? Does light travel through space forever? Since light doesn't have rest mass but has energy, so if huge amount of light is accumulated at a point in space, will it warp space-time? How can you change the energy of a photon? Does light have kinetic energy? Why is dark energy the leading theory for why the universe is expanding? Could light be refracted into a loop, to be amplified or stored as a source of potential energy? How is the energy of a photon calculated? Does accelerating universe expansion fade off star light? Is vacuum energy infinite? How far can sunlight travel in space? Light needs a medium to travel, so how does sunlight come from space? Why is the dark matter being transformed into dark energy? Is vacuum energy the same as dark energy? is it infinite? if it is, how and why? If the Universe stops expanding, would that mean that dark energy became 0 or more (infinite) of it could still be created? Can we use  kinetic energy of cosmic rays as energy resource? If universe stops expanding, would that mean that dark energy became 0 or more (infinite) of it could still be created? What is dark energy in space? Is vacuum energy infinite? If it is, how and why? Is it dark energy? Can energy create space time and dimensions? What is the definition of energy of a photon? If photons have no mass, how are solar sails pushed? Why is vacuum energy infinite? Does the light energy only convert into heat energy? Can't it convert into any other energy? If it can give me an example? Could dark energy be caused by a reaction in the Universe? Is at least the potential energy of vacuum energy and dark energy infinite? Is vacuum energy infinite? How and why? Does space expands faster than speed of light?