MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Illustration of one of the Voyager probes passing an earthlike planet orbiting a binary star system in the distant future. A nebula is seen in the background. The two Voyager probes were launched in the late 1970s. Voyager 1 has now passed into interstellar space - beyond the influence of the Sun's magnetic field - and Voyager 2 is set to do so in the early 2020s.
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