Astronomy

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Across
  1. 2. Icy object with a tail that orbits the sun
  2. 5. Large celestial body that orbits a star
  3. 6. Huge collection of stars, gas, and dust
  4. 7. Instrument used to observe distant objects
  5. 8. Cloud of gas and dust in space
Down
  1. 1. Rocky object orbiting the sun
  2. 2. Group of stars forming a pattern
  3. 3. Earth's natural satellite
  4. 4. Region in space where gravity is so strong that nothing can escape