Final answer:
Time travel is a topic of debate in physics, and while theories exist, there is no scientific evidence or practical methods to achieve it currently.
Step-by-step explanation:
Time travel has been a popular concept in science fiction, but its possibility according to our current understanding of physics is still a topic of debate. According to the theory of general relativity, the possibility of time travel through the use of gravity exists in theory. For example, it is suggested that a time machine could be constructed using gravity that could take a person into the future. Theoretical physicists have also explored the idea of using wormholes, which are hypothetical tunnels connecting distant points in space-time, for time travel. However, it is important to note that there is no scientific evidence or practical method available at the moment to achieve time travel, and it remains purely speculative.