A dark line more than half a million miles long curves across the lower half of the sun in a gorgeous photo snapped by a NASA spacecraft. The line -- what scientists call a solar filament -- is longer than 67 Earths lined up side-by-side.
A dark line more than half a million miles long curves across the lower half of the sun in a gorgeous photo snapped by a NASA spacecraft. The line -- what scientists call a solar filament -- is longer than 67 Earths lined up side-by-side.
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