Alien Life Is Likely, but Interstellar Visitation Remains Unproven
Theoretical physicist Michio Kaku argues in a Diary of a CEO interview that extraterrestrial life is highly likely, but that evidence of alien visitation remains inconclusive and interstellar travel would require physics far beyond present human capability. He uses that distinction — between observed reality, mathematical possibility and speculation — to frame claims about UAPs, string theory, black holes, the multiverse, AI, quantum computing and longevity. His central warning is that science is expanding what may be possible faster than humanity has proven it can manage the consequences.
The Diary of a CEO·May 21, 2026·26 min read