• Any object traveling at relativistic speeds will interact with photons in the cosmic microwave background. This interaction should create a drag that imposes specific limits on how fast spacecraft can travel, they say.
  • The movement of a relativistic spacecraft will have another effect. It should scatter the cosmic microwave background in a way that produces a unique signature that should generate radiation in the terahertz to infrared regions of the spectrum.
  • In other words, if relativistic spacecraft are zipping across interstellar space, this kind of signature should be visible using the current generation of astrophysical observatories.

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