It's a question many of us have asked ourselves: are we alone in the universe?
From flying saucers to balls of light rocketing through the sky, South Australia has had its fair share of reported UFO encounters.
One avid ABC reader has asked us to delve into the history of the state's major cases, as part of our Curious Adelaide campaign.
So we dusted off some of South Australia's oldest X-Files to find answers.
To read more, click here.