Imagine if scientists found out that a massive asteroid was on a collision course with Earth and would strike somewhere near Los Angeles by September 2020. What could humanity do?
No, it's not a self-luminous civilization of aliens living on the dwarf planet Ceres within our solar system – it's likely something much less ominous.
Scientists thought that a distant star's light could possibly be the result of some massive orbiting alien megastructure.
KIC 8462852, a star with a very unusual flickering habit, might not be a star at all. Scientists are pondering another scenario: An alien mega-structure.