Greek and Latin root ast

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Across
  1. 3. The branch of science that deals with celestial objects, space, and the physical universe as a whole
  2. 6. A person who is trained to travel in a spacecraft.
  3. 8. An asterisk is a symbol used for annotations. Resembles a star
  4. 9. Ahe branch of biology concerned with the study of life on earth and in space.
Down
  1. 1. Relating to astronomy.
  2. 2. An event causing great and often sudden damage or suffering; a disaster. This word comes from the prefix (against) and (star) or "against the stars".
  3. 4. The branch of astronomy concerned with the physical nature of stars.
  4. 5. A small rocky body orbiting the sun.
  5. 6. The study of the movements and relative positions of stars.
  6. 7. A flower shaped like a star.