Solar prominences

Prominence \Prom"i*nence\, Prominency \Prom"i*nen*cy\, n. [L.
   prominentia: cf. F. prominence. See {Prominent}. ]
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   1. The quality or state of being prominent; a standing out
      from something; conspicuousness.
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   2. That which is prominent; a protuberance.
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   {Solar prominences}. (Astron.) See {Solar Protuberances},
      under {Protuberance}.
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Protuberance \Pro*tu"ber*ance\, n. [Cf. F. protub['e]rance. See
   {Protuberant}.]
   That which is protuberant swelled or pushed beyond the
   surrounding or adjacent surface; a swelling or tumor on the
   body; a prominence; a bunch or knob; an elevation.
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   {Solar protuberances} (Astron.), certain rose-colored masses
      on the limb of the sun which are seen to extend beyond the
      edge of the moon at the time of a solar eclipse. They may
      be discovered with the spectroscope on any clear day.
      Called also {solar prominences}. See Illust. in Append.
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   Syn: {Projection}, {Protuberance}. protuberance differs from
        projection, being applied to parts that rise from the
        surface with a gradual ascent or small angle; whereas a
        projection may be at a right angle with the surface.
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