Guys, can we really go back in time? Can you really travel through time and space in theory?

Theoretically, it is impossible, because if you want to go back to the past time, the speed of movement must exceed the speed of light, and the speed of light is the limit speed of all substances! Since it is impossible to travel beyond the speed of light, it is naturally impossible to go back to the past.

I think your knowledge may still be lacking. Many things in space-time theory are the basis of modern physics, and many things have been proved by experiments, such as the mass of matter increases with the increase of the speed of matter movement, and space is curved.

I suggest you find some books to read.