Star KIC8462852 is currently in the spotlight due to unexplained observations from the Kepler spaceprobe: one possible explanation for the pattern is an alien megastructure around the star. Here's that serious article by Phil Plait on why this is unlikely but not ridiculous. Freeman Dyson and other astronomers suggested that alien civilizations might build giant structures around stars to make better use of space or materials, or to capture more of the star's energy using solar panels. This is a good scientific idea as it's testable - these structures should be detectable, as they would give themselves away through their interference with the light from their parent star. Science fiction writers have come up with many variations on the theme of alien megastructures, including Larry Niven's Ringworld. SETI astronomers are planning to analyze KIC8462852 using a range of telescopes, looking for signals that might suggest the presence of technology. It's likely that o...