This could be and probably is wrong, but here goes.
There is a guy called Bob, he makes a time machine, goes back a 1000 years to the year 1007. So he looks around tries out some local restaurants, takes the tours. Ok, ignore him for now, go forward 1000 years just before Bob went back in time. At this point there is a Bob in the present, just before he left and a Bob in the past. The present Bob decides as he did before to go back in time to 1007.
DISASTER! He appears at the exact same time and place as he did previously, thus thier bodies merge into something.
So, there are 2 Bobs in the past and one in the present just before he left. Right, so Bob in the present goes back in time again and lands on top of the other 2 and merges with them. Now this happens repeatedly, infact it happens an infinite number of times, until there are an infinite number of Bob's in the year 1007 at the exact same time and place. This of course would create an infinite mass. Which would create a super massive blackhole with infinite power which i presume would eventually consume the entire universe seeing as how it as infinite power. Of course the earth is the first to go. This of course leads to the paradox that since there is no earth there is no Bob and his time machine and thus he never went back in time, thus no black hole. So of course it all starts again with Bob going back in time. The cycle of causality is complete. Feel free to probe my theory.
There is a guy called Bob, he makes a time machine, goes back a 1000 years to the year 1007. So he looks around tries out some local restaurants, takes the tours. Ok, ignore him for now, go forward 1000 years just before Bob went back in time. At this point there is a Bob in the present, just before he left and a Bob in the past. The present Bob decides as he did before to go back in time to 1007.
DISASTER! He appears at the exact same time and place as he did previously, thus thier bodies merge into something.
So, there are 2 Bobs in the past and one in the present just before he left. Right, so Bob in the present goes back in time again and lands on top of the other 2 and merges with them. Now this happens repeatedly, infact it happens an infinite number of times, until there are an infinite number of Bob's in the year 1007 at the exact same time and place. This of course would create an infinite mass. Which would create a super massive blackhole with infinite power which i presume would eventually consume the entire universe seeing as how it as infinite power. Of course the earth is the first to go. This of course leads to the paradox that since there is no earth there is no Bob and his time machine and thus he never went back in time, thus no black hole. So of course it all starts again with Bob going back in time. The cycle of causality is complete. Feel free to probe my theory.