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