The concept of infinite universes, also known as the multiverse theory, is a topic of speculation and debate within the scientific community. While it is true that some theories, such as the Many-Worlds Interpretation of quantum mechanics, propose the existence of multiple universes, it's important to note that these ideas are still theoretical and have not been proven.
Regarding the possibility of alien life developing technology to travel between universes and colonize our universe, it's purely speculative at this point. The existence of other universes or extraterrestrial life is still hypothetical, and we have no empirical evidence to support such claims.
Additionally, even if there were other universes and advanced civilizations in them, the challenges of inter-universe travel and colonization would likely be incredibly complex. The physics and nature of these other universes, if they exist, may differ significantly from our own, making travel between them extremely difficult, if not impossible.
It's essential to distinguish between scientific theories, which are based on evidence and rigorous study, and speculative ideas or science fiction concepts. While the multiverse theory is an interesting concept within the realm of theoretical physics, it remains an area of active research and is far from being firmly established.