Quotes about Impacts

While the prophets are in a way future-tellers, they are concerned with the future as it impinges upon the present. Conversely, liberals who abdicated and turned all futuring over to conservatives have settled for a focus on the present.

Since, in the long run, every planetary civilization will be endangered by impacts from space, every surviving civilization is obliged to become spacefaring--not because of exploratory or romantic zeal, but for the most practical reason imaginable: staying alive... If our long-term survival is at stake, we have a basic responsibility to our species to venture to other worlds.