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The End Is Near for NASA’s Voyager Probes
The two probes have left the solar system and are still collecting data from the interstellar environment—but their atomic hearts are growing weaker and weaker.
The icy giants Uranus and Neptune, in particular, were studied for the first and only time in history by Voyager 2, while successful observations of Jupiter and Saturn were the basis for subsequent interplanetary missions to these worlds, such as Galileo, Juno, and Cassini-Huygens. After their last planetary stops, both probes reached escape velocity for the solar system, allowing them to be released from the sun’s gravity. These instruments were used to study charged particles in the sun’s magnetic field, and it is precisely this detector in 2018 that determined that Voyager 2 had exited the heliosphere and become interstellar.
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