The concept of time travel is still purely theoretical and there is currently no scientific evidence or widely accepted theory that suggests it is possible. Our understanding of the laws of physics, including causality, is based on the assumption that time travel into the past is not feasible.
One of the main challenges associated with the idea of taking objects or information back in time is the paradoxes that arise. For example, the grandfather paradox suggests that if you were to travel back in time and prevent your grandparents from meeting, you would never be born. This creates a contradiction that challenges the logical consistency of time travel.
However, it's worth mentioning that various theories and thought experiments have been proposed to explore the possibility of time travel, such as the concept of closed timelike curves in general relativity. These ideas often involve exotic concepts like wormholes, cosmic strings, or hypothetical particles with negative energy density. Yet, these theories are highly speculative, and there is no consensus among scientists regarding their validity or practicality.
Until scientific advancements provide us with a better understanding of the nature of time and the possibility of time travel, it remains a topic of speculation, imagination, and discussion within the realm of science fiction.