While it's generally accepted that foward time travel is indeed possible (if you accelerate to high speeds time actually passes slower for you than for everyone else), I have my doubts about time travel to the past. The law of conservation of mass and energy states that the amount of mass/energy in the universe is constant. If one was to travel into the past where would the extra mass/energy come from?Anybody looked into this subject much? This is just one of those things that I lie awake at night thinking about.
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