Artist’s illustration of NASA’s New Horizons spacecraft in the outer solar systemJoe Olmsted/STScI 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. Astronomers have now used this change in perspective to work out the probe’s position in the galaxy, in the first ever example of interstellar navigation. New Horizons was launched in 2006, initially to study Pl...