ALL SCI-FI

[Robert (Butch) Day]

This is a handy little diagram for you writers. The curved line shows what the vast majority (99.997%) of Main Sequence stars would look like to Terran-human eyes.



The temperatures are in Kelvin. Above 10,000 degrees Kelvin would be O-class stars; 10,000 degrees Kelvin would be B-class stars; 6,000 degrees Kelvin would be A-class stars; 4,000 degrees Kelvin would be G-class stars; 3,000 degrees Kelvin would be K-class stars and 2,000 degrees Kelvin would be M-class stars.

REMEMBER, this is for Main Sequence stars only. Super Giant, Giant, Dwarf, Sub-Dwarf and Neutron stars have completely different Planckian Locus (as this is named) diagrams. Brown Dwarf stars shine only by reflected light and 'glow' only in infra-red. (Think Jupiter.)

Notice that green is the unlikeliest color. This rules out Marune: Alastor 933, 1975, by Jack Vance and the 'Green Star' series by Lin Carter [Under The Green Star, 1972; When The Green Star Calls, 1973; By The Light Of The Green Star, 1974; As The Green Star Rises, 1975 and In The Green Star's Glow, 1976] and others of it's type.

Pale green is possible, but would be very rare. Purple and violet stars are extremely rare. W-class (Wolfram-Rayet) stars may look deep violet, almost black, but they mostly 'glow' in the ultra-violet range.
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Common Sense ISN'T Common