According to our current understanding of physics, it is not possible to build a spacecraft that can travel at or faster than the speed of light. As an object with mass accelerates towards the speed of light, its mass increases, and it would require an infinite amount of energy to reach or exceed the speed of light. This concept is described by Einstein's theory of special relativity.
However, if we suspend the current understanding of physics and assume a hypothetical scenario where faster-than-light travel is possible, it would have significant implications for space travel. In that case, the limitations imposed by the speed of light would no longer apply, and one could potentially explore vast distances within their lifetime.
For example, let's assume a spacecraft that can travel at ten times the speed of light. In such a scenario, one could theoretically reach destinations that are much farther away within a human lifetime. However, it's important to note that even in this hypothetical situation, there are several other challenges to consider, such as the effects of time dilation, energy requirements, and potential hazards that might arise from interactions with matter and radiation at those speeds.
It's worth mentioning that the concept of faster-than-light travel remains purely speculative at this point, and there is no scientific evidence or technology that supports its feasibility.