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Originally Posted by AntonioLao If I'm not mistaken, it means that photon cannot go backward in time. However, if the universe is proven to be closed then photon can go backward in time and also rotational Godel's universe must also exists. |
Why must Godel's rational universe exist if the universe is closed?
And, why can't a photon go backwards in time, if it has no mass? According to what I know, if something has no mass, then it can go at faster speeds than light, and by going faster than light, you will move backwards in time.