... On the left is a normal star field containing the constellation Orion. ... A Wolf-Rayet Star Blows Bubbles . ... Wolf-Rayet stars can blow bubbles. ... All extremely massive stars will eventually evolve though a Wolf-Rayet phase. ... Wolf-Rayet stars generate bubbles because they continually eject their outer atmosphere as a stellar wind. ... Although Aurora might first appear to be moonlit clouds, they only add light to the sky, and hence can not block background stars from view. ... X-Ray Earth . ...