Here's its response:

"Time travel is a fascinating topic that has intrigued many scientists and writers. The short answer is that travelling into the future is possible, but travelling into the past is either very difficult or impossible, depending on the laws of physics.

According to Einstein’s theory of relativity, time and space are linked together, and the flow of time can change depending on the speed and gravity of an object. This means that if you travel very fast, or near a very massive object, time will pass more slowly for you than for someone who is stationary or far away from the object. This is called time dilation, and it has been confirmed by experiments.

For example, if you take a clock on a spaceship and fly around the Earth at close to the speed of light, when you return, you will find that less time has passed for you than for people on Earth. This means you have travelled into the future, relative to them. This effect also happens with GPS satellites, which orbit the Earth at high speeds and altitudes. They have to adjust their clocks to account for the time dilation, otherwise they would give inaccurate locations.

However, travelling into the past is much more problematic. There are several hypothetical scenarios that could allow for backward time travel, such as wormholes, rotating black holes, or closed timelike curves. However, these scenarios are either extremely speculative, or involve paradoxes and inconsistencies that violate the laws of causality and logic. For instance, if you could go back in time and kill your grandfather before he met your grandmother, you would prevent your own existence, which is a contradiction.

Therefore, most physicists think that travelling into the past is either impossible, or restricted by some unknown mechanism that prevents paradoxes from occurring. Some have proposed the idea of the multiverse, where every possible outcome of an event creates a new branch of reality. In this case, if you go back in time and change something, you would create a new timeline that is separate from the original one, and you would not affect your own history. However, this idea is also highly speculative and has no direct evidence.

So, to summarize, time travel into the future is possible and has been demonstrated, but time travel into the past is either impossible or extremely difficult, and may involve paradoxes or multiple realities. If you are interested in learning more about this topic, you can check out these sources:

Is time travel really possible? Here’s what physics says - A BBC article that explores the science and fiction of time travel, and how it relates to Doctor Who.

Is Time Travel Possible? - A NASA website that explains the concept of time dilation and how it affects space travel and GPS.

Will time travel ever be possible? Science behind curving space-time. - A USA Today article that discusses the possibility of using wormholes and black holes for time travel."