The Sun makes its sphere of influence known with more than just visible light, spewing out a wind of particles that envelops the planets in a protective bubble called the heliosphere. No one knows ...

NASA’s Voyager 1 and 2 are the only probes to cross into interstellar space, but their outdated instruments can’t fully analyze the heliosphere’s boundaries. The heliosphere blocks cosmic ...

Both probes have departed the heliosphere, the vast magnetic bubble created by the sun and surrounding our solar system. They are now just outside the heliopause, the boundary marking the end of ...