According to our current understanding of physics, as described by the theory of special relativity, it is not possible for an object with mass to travel faster than the speed of light in a vacuum. The speed of light is considered an absolute speed limit, and as an object with mass approaches the speed of light, its relativistic mass increases, requiring an infinite amount of energy to reach or exceed the speed of light.
However, let's explore a hypothetical scenario where an object could travel faster than the speed of light. This situation would violate the principles of special relativity, and it is unclear what the specific consequences would be since it falls outside the boundaries of our current understanding.
One speculative concept related to faster-than-light travel is the idea of "tachyons," hypothetical particles that are believed to always travel faster than the speed of light. According to some theoretical models, if tachyons exist, they would have imaginary (complex) mass and could potentially travel backward in time. However, it's important to note that tachyons are purely speculative at this point and have not been observed or confirmed to exist.
It's worth mentioning that the idea of backward time travel or observing events in reverse due to faster-than-light travel is largely based on science fiction rather than established scientific principles. As of now, there is no experimental evidence or theoretical framework supporting the possibility of such phenomena within the context of our current understanding of physics.
It is crucial to approach these speculative concepts with caution and remember that our understanding of the laws of physics is continually evolving. New discoveries and theoretical advancements may provide a more comprehensive understanding of these concepts in the future.