Galaxies Crossword

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Across
  1. 3. Thick distribution of warm gas and stars around the center of a galaxy.
  2. 7. Category of galaxy in which the stars are distributed in an elliptical shape, ranging from highly elongated to nearly circular in appearance.
  3. 8. A type of star cluster made of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age.
  4. 9. Term used to describe mass in galaxies and clusters whose existence we infer from rotation curves and other techniques, but that has not yet been confirmed by observations at any electromagnetic wavelength.
  5. 15. A galaxy that does not fit into any of the other major categories in the Hubble classification scheme.
  6. 16. A distinct body of interstellar clouds (which can consist of cosmic dust, hydrogen, helium, molecular clouds, possibly as ionized gases).
  7. 17. Flattened region of gas and dust that bisects the galactic halo in a spiral galaxy. This is the region of active star formation.
  8. 18. Starlike radio source with an observed redshift that indicates an extremely large distance from Earth. The bright nucleus of a distant active galaxy.
  9. 19. Method of classifying galaxies according to their appearance.
  10. 20. Galaxies that have either a spiral or elliptical shape, but that also have a feature which makes them unique and not well classified as either a spiral galaxy or an elliptical galaxy
  11. 21. Galaxy composed of a flattened, star-forming disk component which may have pinwheel-like arms and a large central galactic bulge.
Down
  1. 1. The structure resulting from the explosion of a star. It is bounded by an expanding shock wave, and consists of ejected material expanding from the explosion, and the interstellar material it sweeps up and shocks along the way.
  2. 2. A type of nebula consisting of an expanding, glowing shell of ionized gas ejected from red giant stars late in their lives.
  3. 4. A spherical cluster of thousands to hundreds of thousands of very old stars. They are very tightly bound by gravity, with a high concentration of stars towards their centers.
  4. 5. Gravitationally bound collection of a large number of stars.
  5. 6. The point about which the disk of a spiral galaxy rotates.
  6. 10. The spiral galaxy in which the Sun resides.
  7. 11. Distribution of material in a galaxy forming a pinwheel-shaped design, beginning near the galactic center.
  8. 12. Two small irregular galaxies that are gravitationally bound to the Milky Way Galaxy.
  9. 13. Region of a galaxy extending far above and below the galactic disk, where globular clusters and other old stars reside.
  10. 14. Extended with no well-defined boundaries. Contrast with planetary nebulae and supernova remnants.