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«As spaceship velocities approach the speed of light, interstellar hydrogen H, despite having density of ~1.8 atoms/cm3, turns into intense radiation that would quickly kill passengers and destroy electronics. Energy of ionizing radiation passing through the ship’s hull would require expensive cooling» - http://www.scirp.org/journal/PaperInformation.aspx?paperID=23913
«Going slow to avoid severe H irradiation sets an upper speed limit of v ~ 0.5 c. This velocity only gives a time dilation factor of about 15%, which would not substantially assist galaxy-scale voyages» ‎· 9000
And this is why you want your life pod somehow hidden behind your Bussard drive collector :) ‎· 9000
so make the astronauts radiation-proof — and poof! to infinity and beyond! ‎· ungodly electric aubergine
^ this is hard due to fundamental reasons. but not impossible! too bad humans remain out of question. ‎· 9000