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Across 2. any celestial bodiy composed of rock and metal that travels around the sun 7. a galaxy in which the stars are distributed in an elliptical shape on the sky 9. A ball of plasma held together by its own gravity 13. a star that has collapsed under its own gravity 16. A type of nebula that is created when an average-sized star, with a mass of less than eight times the mass of the Sun, ends its life 17. a galaxy having a spiral structure 19. How bright a star appears to be from Earth 20. supergiant stars of spectral type K or M.

Down 1. a graph that plots stars color, luminosity, temperature, spectral type, and evolutionary stage 3. a galaxy that does not have a regular shape 4. the result of a dying white dwarf 5. a galaxy with a central bar-shaped structure composed of stars 6. region of space from which nothing, including light, can escape 8. Distance in space is measured in ______________. 10. a star that explodes and becomes extremely luminous in the process 11. star that derives its energy from the conversion of hydrogen into helium in its core 12. a star that has run out of fuel to burn and is slowly cooling off 14. A cloud in outer space consisting of gas and dust 15. a large, old, luminous star; has a relatively low surface temperature and a diameter large relative to the sun 18. a small body consisting of a frozen mass that travels around the sun