- WIKIPEDIA:
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- The chromosphere (literally, "sphere of colour") is the second of the three main layers in the Sun's atmosphere and is roughly 2,000 kilometers deep. It sits just above the photosphere and just below the solar transition region.
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ONLINE ETYMOLOGY DICTIONARY:
- 1868, from chromo-, from Gk. khroma "color" (see chroma) + -sphere. So called for its redness.
- "quality or intensity of color," 1889, from Gk. khroma "surface of the body, skin, color of the skin, color," related to khros "surface of the body, skin," khrozein "to touch the surface of the body, to tinge, to color," explained as being somehow from PIE *ghreu- "to rub, grind" (see grit (n.)).
- sphere (n.)
- 1530s, restored spelling of M.E. spere (c.1300) "space, conceived as a hollow globe about the world," from O.Fr. espere (13c.), from L. sphæra "globe, ball, celestial sphere," from Gk. sphaira "globe, ball," of unknown origin.
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