For instance, an incremental spacecraft speed of 5,994.75 km/s makes the absolute speed 97.85% of light speed, and the resulting mass ratio of 100 may be tractable. The corresponding Isp is 2,676,900 seconds. That is about three orders of magnitude (1,000 times) greater than the best space engines can provide today. Traveling close to light speed with reasonable MR requires either dramatic improvements in propulsion or radically new ways of conceiving propulsion and space travel. Some are discussed below.

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