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Continue to ChatAt two-tenths the speed of light, dust and atoms might not do significant damage even in a voyage of 40 years, but the faster you go, the worse it is--space begins to become abrasive. When you begin to approach the speed of light, hydrogen atoms become cosmic-ray particles, and they will fry the crew. ...So 60,000 kilometers per second may be the practical speed limit for space travel. - Isaac Asimov from https://whatsmyquote.com/quote/at-two-tenths-the-speed-of-light-dust-and-atoms-might-not-do-significant-damage-even-in-a-voyage-of-40-years