Lead: The theories of Albert Einstein helped shape the modern understanding of the universe. One of the most interesting ideas growing out of his work was the clock theory.

Intro.: A Moment in Time with Dan Roberts.

Content: Writing in the early decades of the twentieth century, Einstein, as part of his theory of relativity, advanced the idea that time does not run at the same pace for every observer. If a person holding a clock is riding a train, clock will run a tiny bit slower than a similar clock held by his companion who is standing still beside the track. The difference is caused by the speed of the train. The phenomenon can also be caused by gravity. A clock on the sun - with its stronger gravity - would not run quite as fast as a clock on the earth.

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