https://www.cnbc.com/2018/06/26/elon-musk-on-twitter-why-we-have-to-build-civilizations-in-space.html

Human civilization is likely the only advanced civilization in the “observable Universe," finds a study from the the Future of Humanity Institute (FHI) at Oxford University — and that's why it's so important that humans build civilizations in space, says Elon Musk.

“This is why we must preserve the light of consciousness by becoming a spacefaring civilization [and] extending life to other planets,” the Tesla and SpaceX boss tweeted Sunday in response to a story about the study on science news blog Universal-Sci.