A mission by an unmanned SpaceX Falcon-9 rocket has ended in failure after it exploded after lift-off from Cape Canaveral, Florida. <br /> <br />The rocket was supposed to despatch a cargo ship to the International Space Station (ISS). <br /> <br />The lower segment of the rocket was then meant to turn around and use its engines to bring itself down to a floating barge. <br /> <br />It was US company SpaceX's third failed attempt at the manoeuvre.
