According to mainstream physics and cosmology, time-travel is a certainty!  Establishment ‘science’ claims that ‘spacetime’, or the merger of a spatial map with our human-concept and calculation of time, means pace Einstein, that time is ‘relative’.  According to these ‘geniuses’ there is no distinction between the past, the current or the future.  Given that time is embedded in ‘space’, the establishment theory postulates that we can move backwards or forward in time, akin to rewinding or fast-forwarding a tape. 

Spacetime is of course junk science premised on arcane mathematical models.  We need to remember that much of modern science is meta-physics or ‘ontology’, and not mechanical science.  It is easy to make up theories and supporting maths.  It is harder to prove said theories with evidence. 

Previous posts have discussed light, what time actually is, and why spacetime is scientific and even ontological gibberish.  For example, to move backwards or forward in time, you would need to move all the particles in the universe in an ensemble together to that point in time on a non-existing 4-dimensional axis (x, y, z, t where t = time as the 4^th dimension). 

 

Do you really believe you can forward or rewind all the particles in the universe?  Is there a magic tape recording we can access to do this at the universal level?  The universe does not care about your local time, or your calculation of local time.  There is no mechanism to roll back or roll forward every particle in the universe.  There is no mechanism to roll back or roll forward particles which surround just yourself. 

Entropy and Time

In the physical and real universe, the law of entropy applies.  Entropy measures the level of disorder in a closed system over time.  Within any process entropy will either be unchanged, or it will increase.  Based on what we know, entropy can never decrease.  If we were able to roll back time, we would decrease entropy.  This is physically impossible.  Therefore, time travel is also physically impossible. More here