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The cost-efficient and light Skylon is an unpiloted spaceplane concept by British company Reaction Engines Limited (REL).
Photo credit: Wikipedia
By 2150, futurists envision automated cities with hi-tech districts that are sterile and quiet. Public transport, cars, and other vehicles will be resistant to dirt, bacteria, weather, graffiti, and vandalism.
Photo credit: Luca Oleastri, Dreamstime.com via Futuretimeline.net