Galaxies

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Across
  1. 2. a galaxy in which the stars and gas clouds are concentrated mainly in one or more spiral arms.
  2. 3. type of galaxy with an approximately ellipsoidal shape and a smooth
  3. 5. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
  4. 6. a fixed luminous point in the night sky which is a large
  5. 8. a continuous area or expanse which is free, available, or unoccupied.
  6. 9. the natural satellite of the earth, visible (chiefly at night) by reflected light from the sun.
Down
  1. 1. a galaxy that does not have a distinct regular shape,
  2. 2. the collection of eight planets and their moons in orbit around the sun
  3. 4. a place in space where gravity pulls so much that even light can not get out
  4. 7. the star around which the earth orbits.