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The fate of humanity if aliens were to discover Earth with its balmy climate and bountiful resources, has long been a concern for scientists – many of whom fear the worst.Alien scientists, argued David Kipping and Alex Teachey, may be trying to find habitable planets using the same technique we do – searching for a slight dip in light when a planet "transits" between the star it orbits and the telescopes watching it.Astronomers have verified the existence of nearly 2,000 faraway worlds, but most of those orbiting in habitable zones have been gas giants.Within the wavelength spectrum of visible light, the transit signal could be masked with a monochromatic laser emitting about 30 million watts (MW) for 10 hours at a time, once a year.
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