Scientists are beginning to use the Voyager I spacecraft to make in situ measurements of interstellar space, having applied a “gift from the Sun” to confirm that the venerable probe has traveled into the region characterized by plasma originating in other stars. Analyzing plasma-pressure data that have trickled back over 11.7 billion mi. to Earth at a rate of about 160 bits per second, the science team has concluded that Voyager I has left the relatively low-pressure plasma at the outer ...

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