And so we decided that what it really is is that it is entirely materially closed -- that is, nothing goes in or out at all, no material -- and energetically open, which is essentially what planet Earth is.
I vam establir que realment és quelcom materialment tancat, o sigui, que res pot entrar o sortir, res de material, i energèticament obert. Que és el que, en essència, és el planeta Terra.