• idiomaddict@lemmy.world
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    2 months ago

    I think it’s a variant of #2: the ozone layer is much more susceptible to damage from space flight than we yet realize, and it’s a trade-off between keeping a hospitable home world and interstellar travel. By the time a species is scientifically advanced enough to be technologically capable of it, they learn the risks and decide it’s not worth it.