The Fermi Paradox – Where are all the aliens?

If only 0.1 percent of these Earth-like planets have life, this will result in four million life-supporting dwellings. If only 1% of these planets had sentient life equal to humans, we would have 40,000 civilizations. This is all done with modest estimates, but the difficulty is that we have no proof that these predicted odds are occurring, which is the core of the Fermi Paradox.