Science

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Across
  1. 3. The resistance of an object to changes in its state of motion
  2. 6. A natural science that studies celestial objects
  3. 8. The fundamental force of attraction that exists between all objects
  4. 10. A subatomic particle with a negative electric charge
  5. 13. Organelles in most eukaryotic cells
  6. 14. A layer of gas extending from the Erath's surface
Down
  1. 1. A subatomic particle with a positive electric charge
  2. 2. A system of stars,stellar remnants,interstellar gas, etc.
  3. 4. A fundamental elementary particle that makes up protons and neutrons
  4. 5. An ordered arrangement of the chemical elements into rows and columns
  5. 7. Any living thing that functions as an individual.
  6. 9. Uncharged subatomic particle
  7. 11. A community of living organisms interacting with their environment
  8. 12. A pure substance that cannot be broken down into simpler substances
  9. 15. The colossal explosion of a star