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Majid1986
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a question has made my mind busy...it is told that there is no frictions at space...frictions of air...friction of gravity and etc...none of these does exist in the space (outside the earth)...so we can launch a spacecraft with a primary speed(orbit speed of earth) and equip it with a engine...with a primary speed , and with a engine , and without any friction...theorically we can increase the speed and acceleration...and then reach to a ultra high speed until a speed like light speed...but WHAT IS THE LIMITATIONS?