Following on the heels of its sibling, NASA’s Voyager 2 has entered interstellar space, The Verge reports. The spacecraft’s crossing of the heliopause, the place where hot solar wind meets cold interstellar space, was observed last month by the spacecraft’s plasma-monitoring experiment and validated by three other instruments, NASA announced this morning at a meeting of the American Geophysical Union in Washington, D.C. Along with Voyager 1, which crossed the boundary in 2012, the probes will continue to transmit information on how our heliosphere interacts with the constant interstellar wind. Launched in 1977, the Voyagers are now NASA’s longest-running mission, having far surpassed their original 5-year assignment to study the outer planets of our solar system.
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