Crossword puzzle in physical science

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Across
  1. 4. _____ Redshift is when the time slows down as an object moves toward the area
  2. 10. the special type of reference
  3. 11. he generated and produce radio wave
  4. 12. who studied observed and experimented with inclined planes
  5. 13. _____ speed limit it is the speed of light in vacuum
  6. 14. Mass-energy _____ is the principle which conclude that anything that has mass also has equal energy
  7. 15. speed of moving object with direction
  8. 16. Black _____ is one of the life stages of star
  9. 18. He introduce the in universal law of motion
  10. 19. Length _____ is in which an observer at rest would observe a moving object length
Down
  1. 1. The time _____ is apparently difference in the time interval between two events
  2. 2. He predicted the theory of electromagnetism
  3. 3. he describe the motion of planets around the sun
  4. 5. The change in velocity of moving object
  5. 6. who developed the special relativity theory
  6. 7. a concept in special relativity theory
  7. 8. this is a force that pulls the object with mass together
  8. 9. disturbance in the regular elliptical movement
  9. 17. The speed of _____ is traveling approximately 300,000 km per seconds