... Bubbles and Arcs in NGC 2359 . ... The main suspect is the Wolf-Rayet star in the center of one of the bubbles - visible slightly below and to the right of the center of the above photograph. Aurora Over Circle, Alaska . ... 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. ... The dark spots in the above picture are not photographic defects but an unusual type of interstellar cloud known as a Bok globule. ...