The phrase "alien visitation" refers to the idea or belief that beings from another world or planet have come to Earth to explore or interact with humans. Full definition
Unfortunately for UFOlogists, scientists can not accept as definitive proof of alien visitation such evidence as blurry photographs, grainy videos and anecdotes about spooky lights in the sky. (scientificamerican.com)
Some of the more extreme forecasts made for this time period include alien visitations / invasions, catastrophic asteroid impacts, violent volcanic eruptions and massive earthquakes. (afund.com)
Commercially, of course, it's prudent to venture into avant garde science fiction territory on a smallish budget, the way Jonathan Glazer did with his truly disorienting and memorable 2013 alien visitation film «Under the Skin.» (chicagotribune.com)