> College of Science > Physics Dept > Tatsu Takeuchi > Special Relativity > Lecture Notes > Section 16
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16. Conclusion

I hope I have succeeded in giving you a flavor of Einstein's special theory of relativity. Key points I would like you to take home with you are:

  1. The speed of light is constant regardless of the inertial frame in which it is measured. All of the theory's conclusions are derived from this simple experimental fact.
  2. Simultaneity is a relative concept. The chronological order in which two events occurred may depend on the frame of the observer.
  3. Faster than light speed travel or communication is impossible.
    (Otherwise, causality will be broken.)
  4. Interesting phenomena like time dilation and Lorentz contraction have been predicted and observed.
    (Oops! I should have told you HOW they were observed. Oh, well. I'll do it another time.)
  5. Physics is fun!

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