Space keywords

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Across
  1. 4. when the universe started
  2. 8. a large spherical celestial body
  3. 9. a vast, interstellar cloud of dust
  4. 10. an invisible force of attraction
Down
  1. 1. a natural satellite of the Earth
  2. 2. a luminous explosion of a star
  3. 3. the planet that crashed into the early Earth
  4. 5. a huge collection of planets and stars
  5. 6. a curved repeating path of a planet
  6. 7. a luminous sphere of hot gas