PHY 121 Module 1 Crossword

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Across
  1. 1. A large body that consistently produces its own light.
  2. 3. ______ Matter: Material we cannot see directly with our instruments but we know it is there because of the pull its gravity exerts on the stars.
  3. 4. An atom with 70 protons (warning - a hard word!)
  4. 7. The smallest particle of an element that can still be identified as that element
  5. 8. A proposed explanation that can be tested.
  6. 9. A nearly spherical planet about 13,000 kilometers in diameter.
  7. 11. The smallest particle into which matter can be divided while retaining its chemical properties.
  8. 12. The star Earth revolves around.
Down
  1. 1. Groups of galaxies
  2. 2. A body of significant size that orbits a star and does not produce its own light.
  3. 5. The number of planets that revolve around the Sun.
  4. 6. Earth's satellite
  5. 7. The study of the objects beyond Earth and the processes by which they interact with one another.
  6. 10. Brilliant centers of galaxies