Photo: Joe Acaba/NASA
In this image captured by NASA astronaut Joe Acaba, wispy green swirls of the aurora australis dance around the sky on July 15 as the Canadarm2 robot arm of the International Space Station orbits above the Earth's surface.
The impressive sight was the result of massive solar flares bursting from the sun and slamming into the Earth's atmosphere. Acaba, a flight engineer with the Expedition 32 crew onboard the ISS, recorded the series of aurora images from the station's Tranquility node.
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