it is not currently possible for humans to travel faster than the speed of light. According to our current understanding of physics, as described by Einstein's theory of relativity, the speed of light in a vacuum is considered the universal speed limit.
However, when you mention traveling far in space and time, it's important to clarify a few concepts. While we can't surpass the speed of light, there are certain phenomena and theories that allow for apparent or relative motion over vast distances.
Time Dilation: According to the theory of relativity, time can dilate or slow down for objects traveling at high speeds relative to others. This means that a person traveling close to the speed of light would experience time passing slower than someone who is stationary. Therefore, it is theoretically possible to travel far into the future by undertaking such high-speed journeys, even though one cannot go back in time.
Spacecraft Proximity to Light Speed: Although we can't achieve or exceed light speed, it is still possible to travel considerable distances within our own lifetime. For instance, if we develop spacecraft capable of reaching a significant fraction of the speed of light, relativistic effects would come into play. Time dilation would allow astronauts on board to experience less time passing compared to observers on Earth, effectively enabling them to travel farther into the future while experiencing only a short duration.
Cosmological Expansion: The universe itself is expanding, and this expansion affects the apparent motion of galaxies and other objects. This expansion does not involve physical travel but rather a change in the scale of the universe over time. It allows us to observe objects that are now incredibly distant due to the expansion of space.
Wormholes and Warp Drives (Theoretical): In science fiction and certain speculative theories, concepts like wormholes and warp drives are proposed as means of traveling vast distances in space. These concepts involve bending or warping spacetime to create shortcuts or compress space, allowing for potential faster-than-light travel. However, the realization of such technologies remains purely speculative and theoretical at this point.
It's important to note that our understanding of the universe continues to evolve, and scientific progress may bring new insights and discoveries that could reshape our understanding of space and time travel in the future.