According to our current understanding of physics, it is not possible for anything with mass to travel faster than the speed of light in a vacuum. The theory of special relativity, proposed by Albert Einstein, establishes that as an object with mass approaches the speed of light, its energy and momentum increase infinitely, which is not physically possible.
However, let's consider a hypothetical scenario where faster-than-light travel is possible. If you were to travel faster than light, several interesting consequences arise:
Time dilation: According to special relativity, as you approach the speed of light, time dilation occurs. This means that time would slow down for you relative to an observer who is stationary. If you were traveling faster than light, it could potentially lead to even more extreme time dilation effects, potentially causing time to flow backward from the perspective of an outside observer.
Relativistic Doppler effect: As you approach the speed of light, the wavelengths of light emitted in front of you would appear to be blue-shifted (shifted towards shorter wavelengths), while the wavelengths emitted behind you would be red-shifted (shifted towards longer wavelengths). If you were traveling faster than light, this effect would be even more pronounced, potentially resulting in extreme shifts in the observed wavelengths of light.
Causality violations: One of the fundamental principles of physics is causality, which states that an event cannot influence another event that is spacelike separated (outside each other's light cones). If you were able to travel faster than light, it would violate causality and potentially lead to paradoxes, such as being able to observe an effect before its cause.
It's important to note that the above scenarios are purely speculative and based on hypothetical situations that are currently not supported by our scientific understanding. The limitations imposed by the speed of light are deeply ingrained in the fabric of our current physical models and play a fundamental role in the laws of physics as we know them.