Is my answer to this question correct? Are there small errors in it? "Q: Why do we suspect that travel between the stars is nearly impossible? A: The distance between stars is extremely large in human terms. No spacecraft can possibly travel faster than the speed of light (299,792,458 m/s) through space. Thus, humans cannot use extremely fast spaceships to overcome those enormous distances. To reach the nearest star (Proxima Centauri) at 4 ly away from Earth, a spacecraft would take 150,000 years. Even if humans did launch a spacecraft to Proxima Centauri, this spacecraft would require an inordinate amount of fuel. The amount of fuel required for a fairly small spacecraft to reach Proxima Centauri in a decade is hundreds of times more than the amount of fuel whole industrial countries use up yearly.
It must be noted that those limitations mentioned above not only restrict the possibility of inter-stellar travel for humans, for also for any other intelligent life-forms that could exist in other solar systems.