Key Astronomy Terms

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Across
  1. 4. The brilliant explosion of a dying supergiant star.
  2. 7. The first four inner planets.
  3. 9. An imaginary line that passes through a planet center.
  4. 10. An optical instrument used to see distance objects.
  5. 12. The distance between the crest of each wave.
  6. 13. The blocking of an object by another object in space.
Down
  1. 1. The system containing of the sun and the planets and objects orbiting it.
  2. 2. The initial explosion that caused the formation of the universe.
  3. 3. An object that orbits a planet.
  4. 5. A building that contains one or more telescopes.
  5. 6. An object whose gravity is so strong that nothing can escape, not even light.
  6. 8. An object that orbits a star.
  7. 9. A rocky object that orbits the sun, but too small to be considered a planet.
  8. 11. A ball of hot gas that undergoes nuclear fusion.
  9. 14. A loose collection of ice and dust that orbits the sun.