Cygnus World School, Word Wander

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Across
  1. 2. The smallest unit of life. (4 letters)
  2. 4. The transfer of energy from a warmer object to a cooler one. (4 letters)
  3. 6. An object that attracts certain metals. (6 letters)
  4. 9. A celestial body orbiting a star. (6 letters)
  5. 10. The path one object takes around another in space. (5 letters)
Down
  1. 1. A substance made of hydrogen and oxygen. (5 letters)
  2. 3. A form of energy that makes vision possible. (5 letters)
  3. 5. The basic unit of a chemical element. (4 letters)
  4. 7. The force that pulls objects toward Earth. (7 letters)Orbit
  5. 8. The capacity to do work or produce change. (6 letters)