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traced it farther. This corona is still one
of the wonders of astronomy, and leads to
many questions. What is its consistency, if
it extends many million miles from the sun’s
surface? How is it that it opposed no resis-
tance to the motion of comets which have
almost grazed the sun’s surface? Is this the
origin of the zodiacal light? The character
of the corona in photographic records has
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