A structured review of technosignatures organized by scales from Earth to the universe, covering planetary, stellar, interstellar, and galactic possibilities along with detection methods and synergies with biosignatures.
Limits and Signatures of Relativistic Spaceflight
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abstract
While special relativity imposes an absolute speed limit at the speed of light, our Universe is not empty Minkowski spacetime. The constituents that fill the interstellar/intergalactic vacuum, including the cosmic microwave background photons, impose a lower speed limit on any object travelling at relativistic velocities. Scattering of cosmic microwave phtotons from an ultra-relativistic object may create radiation with a characteristic signature allowing the detection of such objects at large distances.
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2026 1verdicts
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The Search for Technosignatures: a Review of Possibilities
A structured review of technosignatures organized by scales from Earth to the universe, covering planetary, stellar, interstellar, and galactic possibilities along with detection methods and synergies with biosignatures.