Space Review

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Across
  1. 3. nuclei of two smaller atoms join to form a larger atom releasing energy
  2. 5. transfer of energy by the movement of a fluid
  3. 6. slow motion of Earth's axis that traces out a cone over a period of 26,000 years
  4. 8. spinning motion of a planet on its axis
  5. 9. transfer of energy by electromagnetic waves
Down
  1. 1. transfer of energy by collisions or direct contact
  2. 2. center of mass of two or more bodies orbiting around each other
  3. 3. massive nucleus splits into smaller nuclei with the release of energy
  4. 4. periodic oscillation or wobbling of the Earth's axis
  5. 7. circular movement of an object around another object; orbit