Time travel is possible. Einstein taught us that

Theoretical physicist Prof. Brian Greene is enchanted by time (everyone is). Is the time we experience in our day-to-day lives actual? Is our understanding of time truly how the world is organized? Can time be broken up into particles just like matter? These queries fuel Greene’s curiosity and their most possible solutions specify that time travel into the future are very much conceivable. But traveling back in time, well, probably not. Greene clarifies why.