http://en.wikipedia.org/wiki/Helios_(spacecraft) http://en.wikipedia.org/wiki/Helios_(spacecraft) 70 km/s. I personally wouldn't want to take that specific tri

http://en.wikipedia.org/wiki/Helios_(spacecraft) http://en.wikipedia.org/wiki/Helios_(spacecraft) 70 km/s. I personally wouldn't want to take that specific trip, but regardless :) Inertia is a much smaller problem than subjecting humans to acceleration :) You can't afford to accelerate fast anyway. Thankfully spacecraft speed up and slow down quadratically with respect to acceleration. To get to a speed of 0.00014c if you were accelerating at 9.8m/s^2 ("Earth gravity") you would need to wait... https://www.google.ca/search?client=ubuntu&hs=2dC&channel=cs&q=%280.00014+*+speed+of+light%29+%2F+%289.8m%2Fs%5E2%29&oq=%280.00014+*+speed+of+light%29+%2F+%289.8m%2Fs%5E2%29&gs_l=serp.3...62176.68334.0.68491.22.21.1.0.0.3.122.1601.18j3.21.0...0.0...1c.1.11.serp.zU9YJuGGHp0 https://www.google.ca/search?client=ubuntu&hs=2dC&ch... 1 hour and 15 minutes to reach top speed. (The same to slow down (ignoring relativistic effects.)) This is a drop in the bucket vs. 100,000 years, or a human lifetime :)