From Newtonian theory massless particles wouldn't experience force of gravity. Then from General relativity prospective gravity is ripples in space time due to a massive body so other objects move in the straight path in this curved space-time hence this objects appears to move in a curved path. Then what would happen if we have a massless particle with no energy. As space time is curved (path the objects move is curved) shouldn't it move in a curved path. If it moves in the curved path doesn't it mean that massless particle also experience gravity. I am confused can anybody help.