Introduction by Carl Sagan When we lift our eyes to the night sky, we are reminded of how small we are — and how vast the universe is. Once, humanity told myths of gods riding chariots through the heavens. Today, we speak of interstellar visitors, comets, and UFOs. But beneath the language of myth and the language of science lies the same impulse: wonder, … [Read more...] about Interstellar Warnings: UFOs, Oumuamua, and Humanity’s Future