Big Bang Theory

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Across
  1. 3. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
  2. 10. the interaction of electric currents or fields and magnetic fields.
  3. 12. nonluminous material that is postulated to exist in space and that could take any of several forms including weakly interacting particles
  4. 13. the displacement of spectral lines toward longer wavelengths in radiation from distant galaxies and celestial objects.
  5. 14. a theory of exponential expansion of space in the early universe.
  6. 15. a variable star having a regular cycle of brightness with a frequency related to its luminosity, so allowing estimation of its distance from the earth.
Down
  1. 1. the average density of matter required for the Universe to just halt its expansion, but only after an infinite time.
  2. 2. a region of space having a gravitational field so intense that no matter or radiation can escape.
  3. 4. any of the four basic forces—gravitational, electromagnetic, strong, and weak
  4. 5. Begins about 50,000 years after the Big Bang
  5. 6. the SI base unit of thermodynamic temperature
  6. 7. the effect whereby the position or direction of an object appears to differ when viewed from different positions
  7. 8. the state, fact, quality, or condition of being singular.
  8. 9. a change in frequency due to the Doppler effect.
  9. 11. the science of the origin and development of the universe