How does a clock become precise enough to guide a spacecraft across interstellar distance without drifting a single second ...
In the iconic opening sequence of the 1960s TV show "Star Trek," the viewer has this feeling of drifting through space, plunging through a field of stars. (SOUNDBITE OF TV SHOW, "STAR TREK") WILLIAM ...
As it hurtles out of our solar system, NASA’s New Horizons spacecraft is so far from Earth that the stars in the Milky Way appear in markedly different positions compared with our own view.