Big Bang theory vocab.

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Across
  1. 3. speed at which light waves propagate through different materials
  2. 4. the same properties at every point
  3. 7. a material composed of antiparticles
  4. 9. mass of a unit volume of a material substance.
  5. 10. a quantum of electromagnetic radiation
  6. 11. the change in the frequency of a light wave depending on whether an object is moving towards or away from us
  7. 14. a physical quantity that expresses hot and cold or a measure of the average kinetic energy of the atoms or molecules in the system
  8. 15. the science of the origin and development of the universe.
Down
  1. 1. subatomic particle of the same mass as a proton but having a negative electric charge and oppositely directed magnetic moment.
  2. 2. the SI base unit of thermodynamic temperature
  3. 5. a contraction of the universe to a state of extremely high density and temperature
  4. 6. the density of matter that would be required to halt the expansion of the universe.
  5. 8. the progression of events from the past to the present into the future
  6. 12. the smallest unit of ordinary matter that forms a chemical element.
  7. 13. having uniform physical properties in all directions