Ems are still limited by the amount of available matter. They may enable you to colonise non-Earthlike planets, but you still need to colonise.
In fact, pretty much everything possible is limited by available energy and matter.
Ems are still limited by the amount of available matter. They may enable you to colonise non-Earthlike planets, but you still need to colonise.
In fact, pretty much everything possible is limited by available energy and matter.