The Universe CH.18

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Across
  1. 4. The longitude of a place on the Earth's surface is comparableto the ___ of the star on the celestial sphere.
  2. 6. Astronomers think a __ black hole lies at the center of the Milky Way.
  3. 9. Stars are born in giant clouds of gas and dust, such as the Great __ in Orion.
  4. 10. A "new" star is called a __.
  5. 11. The diagonal group of stars on an H-R diagram is called the __.
  6. 12. When a star runs out of nuclear fuel, the core begins to __.
  7. 14. The celestial sphere is divided into 88 __.
  8. 16. Analysis of the __ of a star reveals the composition of the star.
  9. 18. A red giant star ends its life as a __ Dwarf.
  10. 20. Pulsars are a type of __ star.
Down
  1. 1. The apparent change of the position of a star due to Earth's orbiting the Sun is called?
  2. 2. First-magnitude stars are __ than fifth-magnitude stars.
  3. 3. The extension of the Earth's equator onto the celestial sphere is called the?
  4. 5. The __ cycle is 11 years long.
  5. 7. Type M stars are __ in color.
  6. 8. are sudden, bright, explosive events originating from the Sun's surface
  7. 13. The apparent annual path of the Sun on the celestial sphere is called the ___.
  8. 15. The most catastrophic of stellar explosions is called a __.
  9. 17. is the totality of matter, energy, and space.
  10. 19. The Sun's energy comes from the __ of hydrogen into helium.