Astronomy Unit Crossword

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Across
  1. 3. An extremely large amount.
  2. 5. A vast mass of gas from which a galaxy is thought to develop.
  3. 9. A building in which images of stars, planets, and constellations are projected on the inner surface of a dome for public entertainment or education.
  4. 10. A sea monster in Greek mythology which both Perseus and Heracles needed to slay
Down
  1. 1. The luminous envelope of a star from which its light and heat radiate.
  2. 2. A constellation of the northern sky easily recognized by a group of five bright stars forming a w
  3. 4. The rarefied gaseous envelope of the sun and other stars.
  4. 6. A colourless unstable toxic gas with a pungent odor and powerful oxidizing
  5. 7. A reddish gaseous layer immediately above the photosphere of the sun or another star.
  6. 8. Any of a number of subatomic particles carrying a fractional electric charge