According to our current understanding of physics, it is not possible for any object or information to travel faster than the speed of light in a vacuum. The theory of relativity, developed by Albert Einstein, sets a fundamental limit on the speed of light as the maximum attainable speed in the universe.
When we observe light from distant sources, such as stars or galaxies, we are indeed seeing the light that was emitted in the past. This is because light takes time to travel across vast distances, and the speed of light is finite. The farther away an object is, the longer it takes for its light to reach us.
However, even if we were able to travel at or close to the speed of light, we would not be able to "go into the past" with respect to Earth. The theory of relativity states that as an object approaches the speed of light, time dilation occurs. This means that time slows down for the object in motion relative to a stationary observer. From the perspective of a traveler moving near the speed of light, their own experience of time would be normal, but they would observe time passing differently for those on Earth.
Nevertheless, it's important to note that at this time, we do not have any confirmed methods or technologies that would allow us to travel anywhere near the speed of light. Theoretical discussions about time dilation and the effects of traveling at such speeds are based on the principles of relativity, but practical applications remain highly speculative.