Then, one morning, about six months after it had arrived, the starship was no longer there and our entire sun was visible again. The aliens, who ever they were, never contacted anyone on Earth. They never made any direct social, physiological, or material changes. Many people wondered aloud if the alien starship might actually still be up there, orbiting our world and blocking our sun, but undetectable by our current technology still watching us and judging us. Maybe it's this fear that inspires the new compassion that we all now share.
Fear is a strong motivator.
And yet, the relevant question remains. Aliens do exist.