A very interesting potential solution to the Fermi paradox which turns the Kardashev scale on it’s head. It suggests that intelligent lifeforms will have a tendency to evolve and expand inwards rather than outwards. It seems like this balances on the idea that transforming biological lifeforms into a denser substrate (computational on silicon, initially?) and then acceleration of energy efficiency gains by increasing the “computational density” will occur quicker than expansion into space (very time consuming without energy to reach very high speeds) to find more energy.