Or they are seeded by the same people. Yeah, I recently re-watched Stargate.
As far as the exact rules of physics, we're built for 1G. We keep finding Super Earths where gravity would be more than 1G. How would those same physics and math work out for civilizations?
That's just because our current way of finding exoplanets works best with heavier planets. There could be billions of earth-like planets but we can't (yet) find them effectively.
As far as the exact rules of physics, we're built for 1G. We keep finding Super Earths where gravity would be more than 1G. How would those same physics and math work out for civilizations?