Posts by greatconcavity
Would it be possible for a fully modern civilization (i.e. quite like our own, perhaps slightly more advanced, with near-future tech) to arise on an Earth-like planet devoid of uranium, plutonium, ...
If I understand correctly, it's highly likely that the planets in a twin-Earth binary planet system would be tidally locked. But is it totally impossible for them to be much farther apart"”say, at ...
