Hydr-, A-, Astro-

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