Innovators in Astronomy

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Across
  1. 3. A galaxy outside the Milky Way, discovered by Edwin Hubble.
  2. 5. Technique used by Edwin Hubble to identify what galaxies are made of.
  3. 8. Philosopher known for the "Theory of Forms" and his Academy.
  4. 12. Instrument used by Ptolemy to measure the heavens.
  5. 13. Ratio Mathematical concept, associated with Aristotle, involving harmony in proportions.
  6. 14. The Earth-centered model of the universe, proposed by Ptolemy.
  7. 15. A key concept valued by Pythagoras and Plato, seen in geometry and numbers.
Down
  1. 1. Believed in balance instead of perfection, and tutored Alexander the Great.
  2. 2. A type of variable star used to measure distances in space.
  3. 4. The idea, supported by Hubble, that the universe is growing and galaxies are moving away from each other.
  4. 6. Term for the school founded by Pythagoras, focused on numbers and geometry.
  5. 7. Founder of a school of math, philosophy, and mysticism in Samos.
  6. 9. The school founded by Plato in Athens.
  7. 10. The Sun-centered model of the universe, proposed by Copernicus.
  8. 11. The school founded by Aristotle in Athens after Plato's death.