as with many laypersons who have an abiding interest in physics and the nature of reality, i only know enough to generally confuse myself. so if i am asking a senseless question, please tell me the fallacy in my assumptions. assume that i am going on a short interstellar journey to a nearby star that we measure on earth to be about 10 LY away. i have a ship that can travel at 0.99999999C. an observer on earth will watch my trip to the star and report that it took me about 11 years to reach my destination, and another 11 years to return - a total of about 22 years have passed on the clocks on earth during my journey. however, due to time dilation, the clock on my ship indicates that only about 2 years have passed during the entire journey. so, have i travelled faster than the speed of light (ie, gone 20LY in 2 years time), or is the star really not 10 LY distant? am i making some incorrect assumption about time dilation? thanks for any comments that might help me understand this better.