Cosmology

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Across
  1. 2. The conversion of matter into energy, especially the mutual conversion of a particle and an antiparticle into electromagnetic radiation.
  2. 5. The element with atomic number 2.
  3. 6. The density of matter that is just sufficient to halt the expansion of the universe
  4. 7. The moment when the universe starts expanding
  5. 9. The problem of the dark night sky
  6. 10. The era when gravity, strong and electroweak force operated.
  7. 12. The ultimate end of the universe, when the universe contracts to form a black hole singularity, or causing a reformation of the universe starting with another big bang.
Down
  1. 1. Used for measuring cosmic distances, such as distances to stars or galaxies that are far away.
  2. 3. The rapid exponential expansion of the early universe
  3. 4. Meaning: no direction of observation seems different from any other; each region of the sky has roughly the same content.
  4. 8. Our Milky Way is this type of galaxy
  5. 11. The name of the cosmology lecturer :D