Greek Word Parts

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Across
  1. 3. A star-shaped symbol.
  2. 5. The science of stars, and possibly predictions.
  3. 6. A synonym for 'catastrophe'.
  4. 8. A microscopic, parasite, or germ.
  5. 9. Relating to the environment, and natural resources.
Down
  1. 1. A scientist, studying stars and planets.
  2. 2. The study of life.
  3. 4. A piece of potentially harmful debris, within space.
  4. 5. A field of science pursued by astronomers.
  5. 7. The study of communities, families and of relationships.