aurora borealis










Northern Light Show

Brilliant splashes of color lit up the night skies across North America as seen in these two stunning photos of aurora borealis, better known as the "northern lights."

Auroras form when a "solar wind" of charged particles from the Sun enters Earth's magnetic field, accelerating electrically charged particles trapped within. The high-speed particles then crash into Earth's upper atmosphere over the polar regions, causing the atmosphere to emit a ghostly, multicolored glow.

Top Photo: Five miles outside Kearney Nebraska. Credit: Mark Urwiller.
Bottom Photo: St. Francis, Wisconsin. Credit: Jesús Orjeda.

(fr: Nasa)



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