What If We Already Discovered Alien Megastructures?

What if alien civilizations already built giant structures around their stars… and we’ve already seen them without realizing it? Some strange stars dim in ways that don’t fully make sense, leading people to wonder if they could be signs of massive energy-harvesting megastructures called Dyson spheres. Most explanations are probably natural. But the fact that scientists even have to consider the possibility is what makes this so unsettling. Learn more about your ad choices. Visit megaphone.fm/adchoices