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Reaching #orbit means accelerating up to around 28,000kph (22 times the speed of sound). A five-gram #bolt hitting at #OrbitalSpeed packs as much #energy as a 200kg weight dropped from the top of an 18-storey building. The typical #radiation dose from one day in #space is equivalent to what you’d receive over an entire year back on #Earth https://www.sciencefocus.com/space/space-travel-exploration