End of days

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Across
  1. 2. to prevent death
  2. 4. often violentgroup of people on the streets
  3. 7. a body orbiting a planet
  4. 9. the void beyond our atmospere
  5. 11. to hit at a high velocity
  6. 12. synonym of dread
  7. 13. to no longer have human presence
  8. 14. to "fall" around a celestial body
  9. 15. largest planet in the solar system
Down
  1. 1. end of the world in the Christian religon
  2. 3. opposite of start
  3. 5. a force that exists in the fourth dimension
  4. 6. large body threatening earth
  5. 8. natural born leader
  6. 10. a person who experiments to benefit humankind