Can you explain the validity of relativity theory? It seems to me to be untrue, as time is universal, and the time is now everywhere.

That’s seemingly impossible - but it’s DEFINITELY true. The experiment has been repeated THOUSANDS of times (I even did it in a high school physics experiment) - and the answer is always the same.

The point of all this is that from the result of an actual experiment - which has been repeated and confirmed literally THOUSANDS of times - a chain of logic and reasoning that can be explained in about a couple of pages - PROVES that time is NOT universal.

From this weird fact - it’s possible to deduce that relativity must be true.

I’m Considering Asking My Female Friend to Do Something Many Women Would Never Agree To - Slate Magazine

And here is another…

Here is Albert Einsteins’ thought experiment - if you can follow it through - you’ll be convinced…

Here is another version of that…

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If that’s not...

They found a VERY strange thing about light. No matter where the light comes from - no matter whether the source of the light is coming towards you - or away from you. No matter how you’re moving towards or away from the light source…THE SPEED OF THE LIGHT YOU MEASURE NEVER CHANGES.

Two guys - by the name Michelson and Morley did an experiment to measure the speed of light in different directions…

New Research Reveals That the Universe Could End Way Sooner Than We Thought - SciTechDaily