Part 2: Crossword

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Across
  1. 4. Contains no protons, neutrons and electrons; makes up most of the mass of galaxies and galaxy clusters (2 words).
  2. 6. Particles acquire mass as they travel through this field Down
  3. 7. A star whose apparent brightness changes predictably with time.
  4. 8. Distortion of light from a far galaxy by a massive object closer to us (2 words)
  5. 9. The study of the universe.
Down
  1. 1. Describes the evolution of the universe from a singularity (3 words).
  2. 2. Force responsible for universal expansion (2 words)
  3. 3. The largest, most massive, structures in the universe (2 words)
  4. 5. Hypothetical shortcut through spacetime.
  5. 10. A collection of stars held by mutual gravity.