Unknown Celestial Object Blue Raisin Near The Moon? massive planet like object in Orion. A Blue Giant Star, Betelgeuse and Green Stars. Well…lol Green Stars science tells us they don’t exist and that it is an optical illusion. The human eye sees a star as green when a near by red giant is lurking close by. It can cause us to see a star green. That is why sometimes in the Constellations we see many green looking stars as the blue and red stars there give our eyes back a greenish color.