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I'm no astrophysicist, though Frank is. The two concepts I'm referring to as being "discarded" were Newton's idea that motion (ie: time and space) exist in a fixed frame of reference. I think it's fair to say Einstein tossed that out wholeheartedly. The other idea Frank mentions that Einstein threw away was the idea of an æther that filled the voids in the universe. According to Frank, Einstein didn't like this idea so he just worked without it.

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