New Horizons may have seen a glow at the solar system’s edge

The ultraviolet signal may mark a wall of hydrogen where the sun’s influence wanes

hydrogen wall illustration

HELLO FROM THE OTHER SIDE  The sun’s journey through the galaxy may build a wall of hydrogen near the edge of the solar system (curved line to the left of this illustration). The New Horizons spacecraft may have seen evidence of just such a wall.

Adler Planetarium/IBEX/NASA

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