My answer to The Drake Equation predicts the rise of 50,000 advanced alien civilisations though we have no evidence…
Answer by Desmond Last:
Almost without a doubt there are in the Universe Planets inhabited by human beings.
Drakes with his Equation was on the right track but missed a vital factor.
In one billion years time where will the inhabitant of Planet Earth be?
In 100 billion years time where will the inhabitants of Planet Earth be?
Let us assume we do not become extinct because we have destroyed each other by war or Climate Change.
Then in 100 billion years time we would have found other Planets to inhabit.
We would also have found out how to travel in Space by overcoming time and distance.
That means right now we are being watched. Better be on your best behavior or you may be vaporized and that hurts.