Aurora
NATURAL LIGHT DISPLAY THAT OCCURS IN THE SKY, PRIMARILY AT HIGH LATITUDES (NEAR THE ARCTIC AND ANTARCTIC ON EARTH) OR EVEN ON OTHER PLANET
Aurora borealis; Aurora australis; Aurora Borealis; Auroral light; Polar Aurora; Dance of the spirits; Aurora Australis; Aurora Borelis; Aurorae; Aurora boreal; Polar light; Polar aurora; Aurora polaris; Aurora (phenomenon); Auroras; Auroral; Auroral display; Auroral displays; Arora borealis; Aurora austrealis; Aurora borelis; Aurora Lights; Merry Dancers; Auroræ; Aurora (astronomy); Southern lights; Polar lights; Polar Light; Polar Lights; Northern light; Proton aurora; Aurora Polaris; Southern light
["The Aurora Or-Parallel Prolog System", E. Lusk et al, Proc
3rd Intl Conf on Fifth Generation Comp Systems, pp. 819-830,
ICOT, A-W 1988].