physics crossword puzzle

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Across
  1. 4. PROTON ANTI PARTICLE IS
  2. 5. MOTHER EARTH
  3. 6. METALS ARE
  4. 7. NUCLEAR PHYSICS WAS DISCOVERED BY
  5. 8. SNELL'S LAW RELATES
  6. 10. THE DEVICE WHICH CONVERTS AC TO DC IS
  7. 12. MAGELLANIC CLOUD IS
  8. 13. CONVERGING LENS IS ALSO KNOWN AS
  9. 15. SI UNIT OF SURFACE TENSION
  10. 17. UNIVERSE IS EXPANDING WAS DISCOVERED BY
  11. 18. FURTHEST MAN MADE OBJECT FROM EARTH
  12. 20. A LONG PROJECTING BEAM FIXED AT ONLY ONE END
Down
  1. 1. USED TO MEASURE LINE SPECTRA
  2. 2. CURRENT NAME ADVANCED X-RAY ASTROPHYSICS FACILITY
  3. 3. ENERGY RELEASED IN NUCLEAR REACTORS
  4. 9. NICOL PRISM MADE OF
  5. 11. NUCLEAR MUSIC GENRE
  6. 14. ULTIMATE FATE OF OUR SUN
  7. 16. FIRST INTERSTELLAR OBJECT TO ENTER THE SOLAR SYSTEM
  8. 19. ATOMIC NUMBER 88