These particles mean Voyager 1 is at the frontier, according to project scientist Ed Stone, who has been working with the spacecraft since it and its twin launched in 1977. Voyager 1's high-energy telescopes are watching charged particles, created when distant stars went supernova. Some of these particles make their way into our solar system, riding along magnetic currents that bring them in toward the sun and us, but for the most part the sun deflects them. Now it is deflecting fewer and fewer at the spacecraft's location 11.1 billion miles from home. Voyager's radio signals take 16 hours and 38 minutes to reach Earth.