An artist's impression of a spacecraft initiating a warp drive. (3000ad/iStock/Getty Images Plus) One of the most significant barriers keeping humanity from the stars is the speed limit of the Universe.Even if we had the technology to rocket us through space on high-speed colony ships, how fast we can travel normally is limited to light speed in a vacuum. Nothing in the Universe can move faster than 300,000 kilometers per second (186,000 miles per second) – and nothing with mass can reach that s...