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Rare Encircling Filament

Wed, Nov 8th, 2017 @ 8:04:00 PM - 

NASA Image of the day

NASA’s Solar Dynamics Observatory came across an oddity that the spacecraft has rarely observed before: a dark filament encircling an active region (Oct. 29-31, 2017). Solar filaments are clouds of charged particles that float above the sun, tethered to it by magnetic forces.

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