Space

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Across
  1. 2. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction
  2. 3. the natural satellite of the earth
  3. 6. all existing matter and space considered as a whole
  4. 7. the star around which the earth orbits
  5. 9. a celestial body moving in an elliptical orbit around a star
  6. 10. the curved path of a celestial object or spacecraft around a star, planet, or moon
Down
  1. 1. rotating around an imaginary axis
  2. 4. 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
  3. 5. a celestial body moving around another celestial body
  4. 8. astronomical object comprising a luminous spheroid of plasma held together by self-gravity