If time travel does become possible then There are many dangers we must be prepared to encounter.
The displacement theory:
One of my favourite rhetorical questions is: how do you define nothing?
If you want to travel back in time you would have to find an area with nothing there. Including the main gases of our atmoshpere. If we travel back in time we are going back to a place that is occupied by matter Be it pollution particles in the air or even air itself. This would cause a cataclysmic explosion because as soon as you arrive back at your chosen time the matter that you are displacing is moving into other matter faster than light causing an explosion much like the atom bomb. This would render your time machine useless and also you human frame. To avoid this we would have to create a space in time like a vacuum containing no matter whatsoever.
The displacement theory:
One of my favourite rhetorical questions is: how do you define nothing?
If you want to travel back in time you would have to find an area with nothing there. Including the main gases of our atmoshpere. If we travel back in time we are going back to a place that is occupied by matter Be it pollution particles in the air or even air itself. This would cause a cataclysmic explosion because as soon as you arrive back at your chosen time the matter that you are displacing is moving into other matter faster than light causing an explosion much like the atom bomb. This would render your time machine useless and also you human frame. To avoid this we would have to create a space in time like a vacuum containing no matter whatsoever.