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Home This artist’s concept depicts one of NASA’s Voyager 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. (NASA/JPL-Caltech) This artist's concept depicts one of NASA's Voyager 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. (NASA/JPL-Caltech)

This artist’s concept depicts one of NASA’s Voyager 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. (NASA/JPL-Caltech)

This artist's concept depicts one of NASA's Voyager 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. (NASA/JPL-Caltech)

This artist’s concept depicts one of NASA’s Voyager 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. (NASA/JPL-Caltech)