While the latter two are impossible to visualize outside of science fiction, Kardashev believed that being a Type 1 civilization is within human reach. We’re more like Type Zero now, and ...

"Some civilizations may prioritize exploration in physical distance without ever needing to expand their energy consumption to Kardashev Type I or Type II scales. Other civilizations may focus on ...

Any type of civilization on the Kardashev Scale would be more than capable of colonizing the universe. But we haven't detected any of these civilizations — and that's the heart of the Fermi Paradox.