Adding fitness effects to the HERITAGE simulator shows that interstellar radiation, if unshielded, degrades the genetic health of a starship crew over 600 years.
Radiation Hazard of Relativistic Interstellar Flight
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abstract
From the point of view of radiation safety, interstellar space is not an empty void. Interstellar gas and cosmic rays, which consist of hydrogen and helium nucleons, present a severe radiation hazard to crew and electronics aboard a relativistic interstellar ship. Of the two, the oncoming relativistic flow of interstellar gas produces the most intence radiation. A protection shield will be needed to block relativistic interstellar gas that can also absorb most of the cosmic rays which, as a result of relativistic aberration, form into a beamed flow propagating toward the front of the ship.
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Genetic evolution of a multi-generational population in the context of interstellar space travels -- Part II: Phenotypic effects of gene expression
Adding fitness effects to the HERITAGE simulator shows that interstellar radiation, if unshielded, degrades the genetic health of a starship crew over 600 years.