Extraterrestrial life has long been a mystery and a wonder to us here on Earth. Is the strange behaviour of Tabby's Star down to alien life forms? AN ALIEN civilisation is growing. As it evolves, it develops ever more complex and energy-consuming technologies. Soon the resources of its home planet no longer satisfy its energy needs, so it begins building megastructures to harvest the energy from its very own sun. Within a relatively short period of time these structures almost completely encase the star, forming a so-called Dyson sphere, providing energy in the order of yottawatts (10~(24) watts) - a sufficient amount to fuel a trip to a neighbouring star system.
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