CH 24:stars and galaxies

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Across
  1. 2. An astronomical object that is the violent end of stars. It leaves behind a white dwarf, neutron star, or black hole.
  2. 3. A large, reddish star that develops when a star ages up to its final state as its hydrogen fuel is used up.
  3. 5. An astronomical object so massive and dense that its intense gravity prevents even light from escaping.
  4. 9. An immense star with diameters greater than 100 suns.
  5. 11. A long, narrow band representing most stars in the universe that stretches diagonally across the HR diagram.
  6. 12. A naturalistic model for the origin of the universe. Claims the earth is 13.5 billion years old from a single dense point of matter.
  7. 16. An unusual star that regularly changes brightness as it expands and contracts.
  8. 17. A huge mass of billions of stars, dust, dust, and other astronomical bodies.
  9. 18. Hubble Space Telescope
  10. 23. A city-sized dense star that is the remnant of a supernova or collapsed white dwarf. Only made of neutrons.
  11. 25. A star’s brightness as it would appear at a standard distance.
  12. 27. The study of the universe, specifically how the universe began and how it has changed over time.
  13. 29. What is the brightest star in the constellation “Big Dipper”?
  14. 30. The change in position of a distant object at one’s viewing position changes.
Down
  1. 1. A star’s brightness as viewed from earth
  2. 4. Theoretical matter that makes up about 27% of the universe. Not observable via electromagnetic radiation.
  3. 6. The distance that light travels in a year.
  4. 7. Process of stellar birth, aging, and death.
  5. 8. Groups or patterns of stars used to subdivide the heavens to locate and name individual stars.
  6. 10. Cosmic Microwave Background Radiation.
  7. 13. The scientific study of the origin of the universe.
  8. 14. A graph used to classify stars based on their color, temperature, and luminosity.
  9. 15. The apparent lengthening of the wavelengths due to the expanding universe is not due to the motion of the stars themselves.
  10. 19. An unusual celestial object that is as bright as a galaxy but appears as compact as a distant star.
  11. 20. A unit of astronomical distance equal to 3.26 light-years.
  12. 21. The hot, dense core of a dead star.
  13. 22. A violent nuclear explosion that occurs when a white dwarf draws in hydrogen from a larger companion star.
  14. 24. A group of stars close enough to be held together by gravity.
  15. 26. An immense cloud of interstellar gas and dust.
  16. 28. A pair of stars connected by gravity.