If earth is here 0 and I go at 90% the speed of light in that direction <--in my space ship and my friend is going a 90% the speed of light in that direction --> in is space ship so it look like this. 90% <-- 0 --> 90% relative to people on earth we each go at 90% the speed of light in oposite direction, how come relative to my friend I would not be going at 180% the speed of light ? and if so what would be my speed relative to my friend if not 180% ? From the point of view people on earth it certainly seem to me that they would see us distance each other at faster than light speed... !?