2017, Book 26 "And when the capsule was travelling at almost the speed of light, the motor had hardly any effect at all. And it was pushing just as hard. Why?"Are you saying that the capsule got heavier the faster it went?" she ventured. Uncle Albert nodded. "But why should a space capsule behave like that?"Anything that goes really fast must get heavier. Not only the capsule, but everything on board."
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