The Clue

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Across
  1. 5. Built with purpose, enduring the test of time.
  2. 7. Absence of light, the canvas for stars.
  3. 8. Shiny and conductive, forged from earth's core.
  4. 10. Bringers of clarity, chasing away the shadows.
Down
  1. 1. When the sun rests, and the moon takes over.
  2. 2. Humming with energy, a bee's electric kin.
  3. 3. Invisible force, driving machines and dreams alike.
  4. 4. Stands above all, reaching for the clouds.
  5. 5. Vast blue expanse, home to stars and storms.
  6. 6. Direction of ascent, where balloons and dreams go.
  7. 9. Together in presence, holding hands invisibly.