Across-word Universe

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Across
  1. 3. A shining light that guides both sailors and lovers (4)
  2. 5. Every action has an equal and opposite ... (8)
  3. 8. What Saturn and married couples both have in common (4)
  4. 9. Like a perfectly tuned string—or a long-term partnership (8)
  5. 11. A value that never changes, like true love (8)
  6. 12. The attractive force between two bodies… or two hearts! (7)
  7. 14. It stores energy and hope—ready to leap (6)
  8. 15. A flow that occurs when there's potential—and a good connection (11)
  9. 16. You’re glowing! Must be love... or decay (9)
Down
  1. 1. The invisible force that draws opposites together—just like love (9)
  2. 2. Quantum state that collapses… like hearts at “I do” (12)
  3. 4. Watt you get when energy meets time (5)
  4. 6. More than a spark—this particle could light up your life (6)
  5. 7. A beautiful mess? The physics of disorder—and wedding planning (7)
  6. 10. Small on its own, but ready to bond (4)
  7. 13. Like the course of true love, it never runs smooth (8)