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An interstellar Bussard ramjet is a spaceship using the protons of the interstellar medium in a fusion engine to produce thrust. The velocity of an ideal ramjet (100% efficient hydrogen fusion engine) could, in theory, approach the speed of light in a time of the order of years, or less. The relativistic effects for such a spaceship would be very large. The parametric equations, in terms of the ramjet's speed, for the position of the ramjet in the inertial frame of the interstellar medium, thedoi:10.1088/0143-0807/26/1/009 fatcat:3it2abddtffkfigh6dpci5pifa