This artist's concept depicts NASA's Voyager 1 spacecraft entering interstellar space, or the space between stars


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This artist's concept depicts NASA's Voyager 1 spacecraft entering interstellar space, or the space between stars.

Interstellar space is dominated by the plasma, or ionized gas, that was ejected by the death of nearby giant stars millions of years ago. The environment inside our solar bubble is dominated by the plasma exhausted by our sun, known as the solar wind.

Attribution: NASA/JPL-Caltech

Licence: Not known