Barriers to Interstellar Travel: Time Dilation, Energy Costs, Radiation Hazards, and Alien Biochemistry

To the point

Even with near-light speed travel or Alcubierre warp drive, physics and biology make visiting and returning from distant stars practically impossible due to time dilation, enormous energy demands, radiation hazards, and incompatible alien biochemistry.

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The Time Exile Curse: Why Einsteins Laws Prove Visiting Aliens Can Never Return Home
ibtimes.com

The Time Exile Curse: Why Einsteins Laws Prove Visiting Aliens Can Never Return Home

As UAP files are declassified and Disclosure Day hits cinemas, physicists argue that any aliens capable of reaching Earth would become time exiles who can never truly go home.