Hydr-, A-, Astro-

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Across
  1. 4. A reference to the absence of life
  2. 5. A person traveling into outer space
  3. 6. star, outer space
  4. 7. no, absence of, not
  5. 8. A person who studies the stars
  6. 10. water
  7. 11. The study of living organisms in an aquatic habitat
  8. 12. The partial or total loss of or the inability to remember
Down
  1. 1. An upright pipe with a spout or nozzle, usually in the street, for drawing water from a main or service pipe
  2. 2. Not containing any cells
  3. 3. To remove water from
  4. 4. The study of the stars and outer space
  5. 5. A branch of astronomy that studies the physical properties of celestial bodies
  6. 9. A bottomless pit; anything too deep or too great to be measured
  7. 10. A plant that grows completely or partially in water