Vocabulary

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Across
  1. 5. Natural force that pulls objects with mass towards each other
  2. 6. subatomic particle with no charge
  3. 9. measures a celestial object's real, intrinsic brightness
  4. 12. process used to explore nature, ask questions, & test ideas
  5. 14. total amount of light or radiant energy an object gives off per second
  6. 15. unit of length used to measure huge distances in space
Down
  1. 1. measure of length from Earth to the sun
  2. 2. measure of how bright a star, planet, or other object looks in the sky when you view it from Earth
  3. 3. subatomic particle with positive charge
  4. 4. path an object takes in space to move around another object, usually curved
  5. 6. reaction where 2 light atomic nuclei combine to form a single nucleus
  6. 7. universe sphere-shaped region of space centered on Earth
  7. 8. unit of distance, total space that a beam of light travels in one Earth year
  8. 10. subatomic particle with negative charge
  9. 11. Basic building block of matter, made up of protons, neutrons, & electrons
  10. 13. push or a pull up on an object that results from the objects interacting