- Glowing mass of gas seen in the Sun’s corona at eclipses and with coronagraphs. Prominences can be active or passive, and are bright only by comparison with the darkness of deep space. Photographed against the Sun’s disc they appear dark. Prominences are huge structures, sometimes much larger than the Earth, and some last for many weeks. Their shape is influenced by solar magnetic fields.
- noun a part of the body which sticks out or stands out.