5th 6Wks Astronomy Vocabulary

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Across
  1. 4. the study of the organization and evolution of the universe
  2. 7. a type of galaxy intermediate between an elliptical and a spiral galaxy containing a large-scale disc but does not have large-scale spiral arms
  3. 8. a galaxy whose shape is an ellipse and that contains no conspicuous interstellar material
  4. 9. the galaxy that contains our Solar System, with the name describing the galaxy's appearance from Earth
  5. 11. a galaxy without any clear symmetry or pattern
  6. 15. a small cluster of galaxies to which our Galaxy belongs
  7. 16. the speculative idea that our universe is just one of many universes, each with its own set of physical laws
  8. 18. explains the behavior of objects in space and time
  9. 19. when lines in the spectra are displaced toward shorter wavelengths, indicates an object is moving towards the observer
  10. 20. when lines in the spectra are displaced toward longer wavelengths, indicates an object is moving away from the observer
Down
  1. 1. a rule that the radial velocities of remote galaxies are proportional to their distances from us
  2. 2. microwave radiation coming from all directions that is the redshifted afterglow of the Big Bang
  3. 3. a barred spiral galaxy approximately 2.5 million light-years from Earth and the nearest major galaxy to the Milky Way
  4. 5. he theory of cosmology in which the expansion of the universe began with a primeval explosion (of space, time, matter, and energy)
  5. 6. a flattened, rotating galaxy with pinwheel-like arms of interstellar material and young stars, winding out from its central bulge
  6. 10. a large region of space (more than 100 million light-years across) where groups and clusters of galaxies are more concentrated; a cluster of clusters of galaxies
  7. 12. an energy that is causing the expansion of the universe to accelerate; the source of this energy is not yet understood
  8. 13. a model in which the universe expands from a Big Bang, stops, and then contracts to a big crunch
  9. 14. a model in which the density of the universe is not high enough to bring the expansion of the universe to a halt
  10. 17. massive particles, not yet identified, that don’t absorb, emit, or reflect light or other electromagnetic radiation;