According to our current understanding of physics, time travel, especially in the sense of traveling to the past, is not possible, even using light or any other form of travel. The speed of light is considered an absolute cosmic speed limit in the theory of relativity, meaning that no information, matter, or signals can travel faster than the speed of light.
One reason why time travel to the past is problematic is the issue of causality. If backward time travel were possible, it could lead to paradoxes, such as the famous "grandfather paradox" where someone travels back in time and prevents their own birth. This raises logical contradictions and challenges the consistency of cause and effect.
Although the concept of time dilation in relativity suggests that time can pass at different rates depending on one's relative motion or gravitational field, it does not provide a mechanism for traveling to the past. Time dilation allows for the slowing down of time or differences in the perception of time between observers, but it does not enable one to go back in time.
It's worth mentioning that there are speculative ideas and theories, such as wormholes and certain solutions in general relativity, that are sometimes discussed in relation to the possibility of time travel. However, these concepts remain largely theoretical, and their feasibility, stability, and practical realization are still subjects of active research and debate.
For now, time travel to the past remains firmly in the realm of science fiction rather than a scientifically established possibility.