query: Why don't big bang photons conserve mass and energy?
positive_passages.docid: 58042
positive_passages.text: Redshifting of Light and the expansion of the universe
negative_passages.docid: 81880
negative_passages.text: How can a photon have no mass and still travel at the speed of light?
negative_passages.docid: 2377
negative_passages.text: Is the total energy of the universe zero?
negative_passages.docid: 30883
negative_passages.text: Why can't energy be created or destroyed?
negative_passages.docid: 34626
negative_passages.text: How does the propagation of gravity work for photons?
negative_passages.docid: 19163
negative_passages.text: Why does the amount of energy transferred depend on distance rather than time?
negative_passages.docid: 44566
negative_passages.text: Is (rest) mass conserved in special relativity?
negative_passages.docid: 83453
negative_passages.text: Why isn't energy conserved in this collision problem?
negative_passages.docid: 55085
negative_passages.text: How come a photon acts like it has mass in a superconducting field?
negative_passages.docid: 115200
negative_passages.text: Why does energy have to be emitted in quanta?
negative_passages.docid: 118268
negative_passages.text: Does light lose energy in transit?
negative_passages.docid: 28165
negative_passages.text: Why can't a single photon produce an electron-positron pair?
negative_passages.docid: 25938
negative_passages.text: Before the Big Bang
negative_passages.docid: 110021
negative_passages.text: extracting energy from cosmological expansion
negative_passages.docid: 91300
negative_passages.text: Does light loses its energy when it passes through denser medium?
negative_passages.docid: 107971
negative_passages.text: Hubble's law and conservation of energy
negative_passages.docid: 151221
negative_passages.text: Does a cooling object lose mass as it radiates?