D all of the above 9 10 an observation of the red

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d. All of the above 9. . 10. An observation of the red shift of galaxies suggests that the universe is a. expanding. b. reversing. c. stagnant. d. contracting. 11. The milky way galaxy contains interstellar matter that may form new 12. 13. . 14. A star’s apparent brightness is dependent upon 15. . 16. Most of the stars in the Milky Way will end their lives as
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17. . 18. Who first proposed that the universe is expanding? a. Hubble b. Kepler c. Copernicus d. Darwin 19. Spiral Galaxies often appear bluish due to an abundance of 20. . 21. Astronomers estimate that the universe contains 22. A light-year is a unit of 23. 24. . 25. Our solar system is part of the a. Andromeda galaxy. b. Milky Way galaxy. c. Alpha Centaury galaxy.
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d. Betelgeuse galaxy. 26. . 27. A star is born when 28. In stars, energy is produced primarily as hydrogen atoms are combined to form 29. . 30. Not including the sun, the closest stars to Earth are 31. Clusters of galaxies can form larger groups called a. constellations. b. supergiants. c. supernovas. d. superclusters. 32. . 33. Supergiant stars
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