Illustration of Voyager Spacecraft and GMIR (IMAGE)

NASA/Goddard Space Flight Center

Illustration of Voyager Spacecraft and GMIR

Caption

The Voyager spacecraft, one in the heliosheath and the other just beyond in interstellar space, took measurements as a solar even known as a global merged interaction region passed by each spacecraft four months apart. These measurements allowed scientists to calculate the total pressure in the heliosheath, as well as the speed of sound in the region.

Credit

NASA's Goddard Space Flight Center/Mary Pat Hrybyk-Keith

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