Vocabulary pt 2

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Across
  1. 3. The apparent displacement of a nearby star caused by the revolution of the Earth around the sun.
  2. 5. Middle-age stars that can be found running diagonally through the middle of an HR diagram.
  3. 6. An object midway in size between a planet and a star, with a mass about 1/100 that of the sun.
  4. 8. The distance from the center of a black hole to its event horizon.
  5. 10. The main portion of a galaxy. Consists of a nucleus, bulge, and spiral arms.
  6. 12. Two stars that revolve around each other.
  7. 15. diagram), A plot of luminosity against surface temperature or spectral type for a group of stars.
  8. 18. A large assemblage of stars without radial symmetry.
  9. 21. The upper boundary to the mass of a white dwarf.
  10. 23. A flattened, rotating, large assemblage of stars with pinwheel-like arms of interstellar material and stars winding out from its nucleus.
  11. 24. A measure of the observed light received from a star or other object.
  12. 29. A collapsed massive body whose escape velocity is equal to or greater than the speed of light.
  13. 30. A star of very high luminosity and relatively low temperature.
  14. 32. An explosion that marks the final stage of stellar evolution.
  15. 33. Large, cold, interstellar clouds with large diameters where massive stars form.
  16. 34. A variable radio source of small angular size that emits very rapid radio pulses in very regular periods.
  17. 35. The outermost extent of a galaxy with a sparse distribution of stars.
Down
  1. 1. The classification of stars according to their temperatures using the characteristics of their spectra.
  2. 2. A spherical collection of stars that orbits a galactic core as a satellite.
  3. 4. The surface at which the escape velocity of a collapsing star is equal to the speed of light.
  4. 7. A low-mass star that has exhausted most or all of its nuclear fuel and has collapsed to a very small size.
  5. 9. A theoretical point of zero volume and infinite density to which any black hole must collapse.
  6. 11. A star of large luminosity and radius.
  7. 13. One of the 107 galaxies, nebulas, star clusters, and other deep sky objects classified with an M followed by a number.
  8. 14. An object of very high redshift that looks like a star but is extragalactic and highly luminous.
  9. 16. A star that experiences a sudden outburst of radiant energy, temporarily exponentially increasing its luminosity.
  10. 17. The rate at which an object must travel in order to break free of the influence of gravity.
  11. 19. An assemblage of stars, oval in shape, that contains no conspicuous interstellar material.
  12. 20. Stars that pulsate radially, varying in both temperature and diameter, to produce brightness changes with a well-defined stable period and amplitude.
  13. 22. A morphological classification scheme for galaxies. Often described as a tuning fork, after the shape of the diagram created from it.
  14. 25. A cloud of interstellar gas or dust.
  15. 26. A large assemblage of stars, gas, dust, and dark matter orbiting a common center.
  16. 27. A measure of the luminosity of an object like a star.
  17. 28. A star of extremely high density composed almost entirely of neutrally charged subatomic particles.
  18. 31. The central part of a galaxy.