12s

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Across
  1. 4. - Fragment of a meteoroid that survives its passage through the atmosphere (9 letters, nine)
  2. 8. - Emission of energy as electromagnetic waves or as moving subatomic particles (9 letters, nine)
  3. 11. - Relating to the moons of Jupiter (9 letters, nine)
  4. 12. - Study of the positions of celestial bodies (9 letters, nine)
  5. 13. - Relating to the sky or the heavens (9 letters, nine)
  6. 14. - Apparent shift in position of a nearby star (8 letters, eight)
Down
  1. 1. - Hypothetical non-luminous material in the universe (10 letters, ten)
  2. 2. - Situated between the Earth and the moon (8 letters, eight)
  3. 3. - Study of the physical properties of celestial bodies (13 letters, thirteen)
  4. 5. - Transmission of data from spacecraft (9 letters, nine)
  5. 6. - Very weak gravitational force (12 letters, twelve)
  6. 7. - Extremely luminous active galactic nucleus (6 letters, six)
  7. 9. - Relating to a nebula (7 letters, seven)
  8. 10. - Relating to stars (7 letters, seven)
  9. 14. - Highly magnetized rotating neutron star (6 letters, six)