Space keywords

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