Even if alien civilizations exist, there are clear physical constraints that could keep them from visiting Earth, a researcher said. Carol Oliver of the University of New South Wales’ Sydney campus cited three reasons: the immense distances in space, the enormous energy required for interstellar travel and the potential dangers of Earth’s environment to non-adapted life. She also said the limited reach and short history of human observations make the lack of contact unsurprising.

If all data centres permitted in the United States through 2025 begin operating, annual electricity use is estimated to rise to 358.8 terawatt hours from 224.3 TWh, up 50 percent from last year’s estimate. The rise is led by hyperscale facilities needed for artificial intelligence. Analysts warn grid and generation investment could be passed on through higher power bills, while some states and counties weigh rules and debate tax incentives.