Could the law of conservation of mass eliminate the possibility of time travel?

Ewa Homrich: The biggest problem with time travel is the possibility of paradox as in the "I went back and killed my grandfather" so how could I exist to go back and kill my grandfather?But yeah, there would seem to be an issue with conservation of mass/energy, You could argue that you subtracted mass from the future to keep things in balance.

Helen Zafar: positron=electron traveling backward in timewhen they meet, they explode and give off energy (energy and matter are the same thing)....im pretty sure that it would be impossible to travel backwards in time anyways, because you would need to create a spaceship out of tachyons...

Erin Arron: Actually time travel into the past is impossible because time is smaller than existence.Here is the thought experiment.Don't worry about math, it is a mistake based on several false assumptions.If it helps I Philosophized this "one of the basic truths of the universe" this morning.2012 05 04 0850 JTK MAH Nothing and Exist! enceTIME is defined by CHANGEThe smallest piece of TIME is the smallest CHANGE in the universe.The smallest CHANGE in the universe Happens between two of the smallest things that exist in the universethe smallest things that exist in the universe?I call them ESTs(Existence's Smallest Things = EST)The smallest change that can happen between two ESTs is When the two ESTs ARE touching. Then the two ESTs ARE NOT touching by the smallest distance.That tiny change between touching and not touching is a change.Why you can not go backward in time, is because The smallest change that can happen between two ESTs isWhen the two ESTs ARE NOT touching by the smallest distance. Then the two ESTs ARE touching.That tiny change between not touching and touching is a change.These two changes, first forward and then backward, exist and they are equalBecause the smallest change and its reverse are equal and exist therefore there is no way to reverse time. The smallest size dimension is NOT an! EST.Because for an EST to exist it must have three dimensions! .The smallest dimension of size is The POINT, Where two ESTs touch the least A smallest LINE is where two ESTs CHANGE from touching to NOT touching.Therefore the smallest time and the smallest size are both defined by the same smallest CHANGE in the universe.Because time can not be smaller than this definition of point-time.and size can not be smaller than this definition of point-size.Therefore:ESTs Existence's smallest thing is (more-size=bigger) than (point-size)andESTs Existence's smallest thing is (more-time=longer) than (point-time).ThereforeExistence can not fit into the smaller (point-time)and Existence can not fit into the smaller (point-size)."NOTHING" is defined by that which is smaller than (point-time) and smaller than (point-size).ThereforeNo EST can come from nothingand No EST can go into nothingThereforeBy definition There is changeThereforeExistence IS eternalbutBecause there is changeExistence IS NOT InfiniteandNOTHING is what is between Existences Smalles! t Things.CopyrightMark Aubery Henne 2012 05 04 10:20 MWG, Sol, Earth, Japan, Tokyo to, Kokubunji shi, Hiyoshi choAt my computer writing to you.Give that to your teacher and see what they say.Good Luck, Have FunMark...Show more

Gaston Edgcomb: Traveling backward in time is impossible; traveling forward in time is difficult but possible.