Steven, you said "If there are aliens out there, they're not coming thousands of light years from a home planet - they're everywhere, in city size ships that wander the galaxy in search of knowledge." What is your evidence?

And you continue: "They would harvest the raw materials their automated production systems need from easy to access and manipulate asteroids, not mines in the bottoms of planet sized gravity wells." What is your evidence?

Would be fair and truthful to say you are speculating without any evidence?