Space Life

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Across
  1. 2. total amount of matter
  2. 3. drawn using string,pencil and two thumbtacks
  3. 4. a tendency to do nothing or to remain unchanged
  4. 7. sun's inward pull of gravity on a planet
  5. 10. 4 moons of Jupiter
  6. 11. two bodies with equal masses under the influence of their mutual gravity
  7. 12. considered a dwarf planet in our solar system
  8. 14. earth is not the center of the universe
Down
  1. 1. discovered the aberration of starlight
  2. 5. semimajor axis of earth's orbit around the sun
  3. 6. also called Tycho he studied astrology, alchemy, and medicine
  4. 8. force of gravity
  5. 9. discovered the law of gravity
  6. 10. Italian philosopher created the telescope
  7. 13. earth ray at center of universe