The sun is huge. It has a diameter of around 865,000 miles (1,392,000 kilometers) compared with the Earth's dainty 7,900 miles (12,740 kilometers). That's how the face of our solar friend can sport a dark filament as long as 50 Earths lined up.
NASA's Solar Dynamics Observatory (SDO), a joint project of NASA and the European Space Agency, took note of the massive filament on October 21, and NASA released information on the fascinating phenomenon Monday. The dark snaking line can be seen on the upper half of the sun.
"Filaments are elongated clouds of solar material that are tethered above the sun by magnetic forces," NASA explains. The SDO captured this view in extreme ultraviolet light, which makes the filament appear as a dark jagged line amid the swirling material of the sun's surface.
Filaments of this size aren't an everyday occurrence. In late 2014, NASA noted aon the sun. Filaments tend to have short lifespans, sometimes fading into obscurity and sometimes in the form of impressive eruptions.
We've had quite a bonanza year so far for spectacular sun images. In February, a daringand managed to survive the relatively close encounter. NASA's Solar Heliospheric Observatory spacecraft saw it as it emerged intact on the other side.
This fall, we saw the, and the SDO treated space fans to a rare taking dark bites out of the sun during a partial solar eclipse. The very long filament seen by the SDO is another in an illustrious line of sun images that are both beautiful and fascinating.