To catch the faint signal of a spacecraft leaving the solar system, you have to listen very carefully. At NASA’s Jet Propulsion Laboratory in Pasadena, Calif., that’s Suzanne Dodd’s job.
Dodd (below) is project manager for NASA’s twin Voyager probes, launched in 1977 to explore Jupiter and Saturn. Voyager 2 did that and more, as the first probe to fly by Uranus, in 1986, and Neptune, in 1989. It’s now 15 billion kilometers from Earth and headed out of the solar system.