galaxy

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Across
  1. 4. the displacement of spectral lines toward longer wavelengths (the red end of the spectrum)
  2. 8. according to current cosmological theories marked the origin of the universe.
  3. 9. the branch of science that deals with celestial objects, space, and the physical universe as a whole.
  4. 10. a system of millions or billions of stars, together with gas and dust
Down
  1. 1. a small very dense star that is typically the size of a planet
  2. 2. a star that suddenly increases greatly in brightness because of a catastrophic explosion
  3. 3. a unit of astronomical distance equivalent to the distance that light travels in one year
  4. 5. a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch
  5. 6. our galaxy
  6. 7. all existing matter and space considered as a whole