Final answer:
Prominences are loops of glowing hydrogen seen during totality, usually originating near sunspots. They can be observed as red features rising above the eclipsed Sun and reaching into the corona. Some eruptive prominences have reached heights of more than 1 million kilometers above the photosphere.
Step-by-step explanation:
Prominences are the loops of glowing hydrogen seen hanging over the solar limb during totality. These spectacular phenomena usually originate near sunspots and can be observed as red features rising above the eclipsed Sun and reaching into the corona. Quiescent prominences are graceful loops of plasma that can remain stable for hours or even days, while eruptive prominences send matter upward into the corona at high speeds. Some eruptive prominences have reached heights of more than 1 million kilometers above the photosphere.