Faster-than-light (FTL) travel is currently considered to be beyond the realm of our scientific understanding. According to our current understanding of physics, specifically Einstein's theory of relativity, objects with mass cannot travel faster than the speed of light in a vacuum. This theory has been extensively tested and has consistently held true.
However, it's worth noting that scientific understanding evolves over time, and new discoveries can reshape our understanding of the universe. While it's difficult to predict the future, it's currently unknown whether humans will ever discover a way to achieve FTL travel or find workarounds to the limitations imposed by relativity.
Regarding the existence of aliens outside of our universe, it's a speculative topic. The concept of a multiverse, which suggests the existence of multiple universes with potentially different physical laws, is an area of active scientific investigation. However, there is currently no direct evidence or consensus on the existence of other universes or extraterrestrial life beyond our own.
The search for extraterrestrial life is a field of ongoing scientific research, with efforts focused on identifying habitable environments and potential signs of life within our own universe. Various missions, such as the search for microbial life on Mars or the study of exoplanets, aim to gather more data and expand our understanding in this area. Until concrete evidence is found, the existence of aliens outside our universe remains purely speculative.