End of days

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Across
  1. 2. A person dedicated to the discovery and invention
  2. 5. Threat to Earth
  3. 7. A pulling force that exsists in the fourth dimension
Down
  1. 1. End of the world in the christian religon
  2. 3. A void outside of our world
  3. 4. Opposite of start
  4. 6. Circle around something with gravity