Danger! This Mission to Mars Could Bore You to Death

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Across
  1. 4. occurring in the mind when someone is not aware
  2. 5. causing sudden grief, great damage or suffering
Down
  1. 1. with a lot of pain
  2. 2. lasting a long time or happening repeatedly
  3. 3. repetitive or reoccurring
  4. 6. something that causes a reaction