Unit 2 Vocabulary Practice

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Across
  1. 2. a system of planets orbiting a central star
  2. 5. forerunner of the present day Sun
  3. 6. the counter-clockwise spin of a planet or moon
  4. 7. 1st planet from the Sun; it is the smallest planet
  5. 8. an object that orbits another object
  6. 10. small bodies of rock from which planets are created
  7. 11. 4th planet from the Sun; sometimes referred to as the Red Planet
  8. 13. means planet in Greek
  9. 14. a universal force of attraction between objects
Down
  1. 1. 2nd planet from the Sun; has the densest atmosphere of the terrestrial planets
  2. 3. the clockwise spin of a planet or moon
  3. 4. the cloud of gas and dust from which the Sun and the rest of the Solar System was formed
  4. 5. a disk of low density material encircling a solar nebula
  5. 9. planets located outside of our Solar System
  6. 12. 3rd planet from the Sun; only planet currently known to sustain life