We know now how little we know about the heliosphere, says Merav Opher, a space physicist at Boston University. It's way more complex, way more dynamic than we thought.
The sun is a roiling mass of plasma and magnetism radiating itself across billions of miles in the form of the solar wind, which is a constant stream of charged plasma that flows off our star.
The heliosphere grows and shrinks in response to changes in solar activity, making it a complex and dynamic environment that impacts our understanding of interstellar space.
Voyager 1 reached the termination shock, the beginning of its yearslong transition to interstellar space, providing humanity's only direct taste of what lies beyond our sun's influence.
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