Activity for greatconcavity
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Question | — |
Could a binary planet system have two non-tidally-locked Earth-like planets? 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 several times the distance between the Earth and the moon"”and rotate independently? (As a cheat, if nec... (more) |
— | about 8 years ago |
| Question | — |
A modern or near-future civilization without nuclear technology? 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, thorium, or any other elements that could lead to the discovery/development of nuclear power or nuclear ... (more) |
— | over 8 years ago |