Space

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Across
  1. 2. all existing matter and space considered as a whole; the cosmos.
  2. 5. a celestial body resembling a small planet but lacking certain technical criteria that are required for it to be classed as such.
  3. 8. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
  4. 9. (in some cosmological theories) non-luminous material that is postulated to exist in space and that could take any of several forms including weakly interacting particles
  5. 10. a celestial body moving in an elliptical orbit round a star.
Down
  1. 1. a massive and extremely remote celestial object, emitting exceptionally large amounts of energy, and typically having a starlike image in a telescope.
  2. 3. a completely empty space.
  3. 4. massive self-luminous celestial body of gas that shines by radiation derived from its internal energy sources.
  4. 6. the natural agent that stimulates sight and makes things visible
  5. 7. a region of space having a gravitational field so intense that no matter or radiation can escape.