rah

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Across
  1. 2. — Region of space with gravity so strong light cannot escape
  2. 3. — Change in wavelength due to motion of a source
  3. 8. — Period when matter dominated radiation in the universe
  4. 10. — Shortening of light waves from approaching objects
  5. 11. — Process that powers stars by combining atoms
  6. 12. — Point of infinite density, such as in a black hole
  7. 13. — Pair of equal and opposite charges separated by distance
  8. 14. — The density needed for the universe to be flat
  9. 16. — Force involving electricity and magnetism
  10. 17. — Measure of how hot or cold something is
  11. 19. — Orbiting observatory used to study deep space
  12. 21. — SI unit of temperature
  13. 22. — Afterglow of the Big Bang detected as microwaves
  14. 23. — Rapid expansion of the universe just after its beginning
Down
  1. 1. — Apparent shift of an object due to viewpoint change
  2. 2. — Model describing the universe’s origin from expansion
  3. 3. — Invisible substance inferred from gravitational effects
  4. 4. — Study of heat and energy transfer
  5. 5. — Instrument used to measure light intensity
  6. 6. — Type of variable star used to measure distance
  7. 7. — Matter made of particles with opposite charge
  8. 9. — Study of the origin and structure of the universe
  9. 15. — Lengthening of light waves from objects moving away
  10. 18. — Early hot, dense state of the universe
  11. 20. — Distance light travels in one year