Stars and Space

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Across
  1. 4. involve the combining of atomic nuclei to form new, heavier nuclei, releasing tremendous energy in the process.
  2. 5. the intrinsic brightness of a celestial object (as distinct from its apparent brightness diminished by distance).
  3. 7. a star that has evolved beyond the main sequence phase and has significantly expanded in size and brightness compared to a main-sequence star
  4. 9. a theoretical, hypothetical celestial object that is a cooled, dense remnant of a white dwarf
  5. 11. a series of star types to which most stars belong, represented on a Hertzsprung–Russell diagram as a continuous band extending from the upper left (hot, bright stars) to the lower right (cool, dim stars).
  6. 12. a small, dense, hot star that represents the end stage of a low- to medium-mass star like our sun
  7. 13. Large spiral galaxy;we live in it
Down
  1. 1. a massive, luminous star in its late evolutionary stage, significantly larger and brighter than a main-sequence star or a giant star
  2. 2. all existing matter and space considered as a whole; the cosmos
  3. 3. a graph that plots a star's luminosity (or brightness) against its surface temperature (or spectral type)
  4. 6. a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.
  5. 8. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
  6. 10. the group in which a star is classified according to its spectrum, especially using the Harvard classification.