Time travel

Time travel

 
Avagadro and time travel
 
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Time travel discussion
 
Maserati1
Just read some of the topics and can see the problems of paradoxes etc. But one thing bothers me about time travel, and especially about going back in time.

What I want to know is this:- if I were able to travel back in time and stepped out of my time machine / worm hole or what ever, what happens when all the atoms that make up me suddenly come face to face with a universe that already contains them? Do I then make the mass of the universe increase by me? Will kids be unable to answer that exam question, Avagadro lives on in all of us - explain?