... Symbiotic Star Bubbles . ... The two stars at the center of this nebula are very different. One is a white dwarf star with a mass similar to our Sun but with a radius as small as our Earth. ... To the unaided eye it appears as an alluring group of stars in the constellation Taurus, while telescopic views reveal cluster stars surrounded by delicate blue wisps of dust-reflected starlight. ... NGC 6188 is an interstellar carnival of young blue stars, hot red gas, and cool dark dust. ...